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WorksheetsIB DP Topic 10 Fields (HL)
Total questions: 56
Worksheet time: 2hrs 1mins
What is a capacitor?
A device for storing energy.
A device for storing p.d.
A device for storing charge.
A device for storing capacitance.
What is the SI, base unit for capacitance
[F]
[s4A2kg-1m-2]
[CV-1]
[CV]
What is the shape of the electric field between two flat charged plates.
A uniform field between the plates with a curved field at the ends.
A uniform field between the plates.
A spherical field increasing towards infinity.
A spherical field decreasing towards infinity.
Which type of graph would correctly explain the relationship between the electric field force, F, between two charges and their separation r.
F is inversely proportional to r.
F is proportional to 1/r.
F is inversely proportional to r2.
F is proportional to 1/r2.
Two protons are 1.0 × 10–14 m apart. Approximately how many times is the electrostatic force between them greater than the gravitational force between them?
1023
1030
1036
1042
The diagram shows how the electric potential varies along a line XX’ in an electric field. What will be the electric field strength at a point P on XX’ which is mid-way between R and S?
5.0 V m–1
10.0 V m–1
20.0 V m–1
30.0 V m–1
Two horizontal parallel plate conductors are separated by a distance of 5.0 mm in air. The lower plate is earthed and the potential of the upper plate is + 50 V. Which of the following is correct at a point midway between the plates??
E = 1x10-4 Vm-1 upwards ; V = 25V
E = 1x10-4 Vm-1 downwards ; V = 25V
E = 1x10-4 Vm-1 upwards ; V = 50V
E = 1x10-4 Vm-1 downwards ; V = 50V
Which of the following could be used to increase the capacitance of a capacitor?
Increase the separation between each metal plate.
decrease the area of the plate
decrease the voltage
Increase the permitivitty of the dielectric
A capacitor of capacitance 15 x 10-6F is fully charged and the potential difference across its plates is 8.0V. It is then connected into the circuit as shown. The switch S is closed at time t = 0. Which one of the following statements is correct?
The time constant of the circuit is 6.0 ms.
The initial charge on the capacitor is 12 mC.
After a time equal to twice the time constant, the charge remaining on the capacitor is Qoe2, where Qo is the charge at time t = 0.
After a time equal to the time constant, the potential difference across the capacitor is 2.96 V.
The graph shows how the charge stored by a capacitor varies with the potential difference across it as it is charged from a 6 V battery. Which one of the following statements is not correct?
The capacitance of the capacitor is 5.0 µF.
When the potential difference is 2 V the charge stored is 10 µC.
When the potential difference is 2 V the energy stored is 10 µJ.
When the potential difference is 6 V the energy stored is 180 µJ
A 1000 mF capacitor, initially uncharged, is charged by a steady current of 50 mA. How long will it take for the potential difference across the capacitor to reach 2.5 V?
20 s
50 s
100 s
400 s
Is there a limit to the amount of charge that capacitor can hold and why/why not>?
Yes, as the ratio of charge to p.d. is fixed.
Yes, because the dielectric will breakdown in such a large field and charge will remain.
No, as capacitance can always increase as p.d. increases.
Yes, because the dielectric will breakdown in such a large field and charge will flow.
A clumsy student drops a bar magnet and it breaks into this configuration. Afterwards, what is the result for the left and right magnets respectively?
N-N on the left and S-S on the right
N-S on the left and N-S on the right
S-N on the left and S-N on the right
S-S on the left and N-N on the right
A clumsy student drops a bar magnet and it breaks into this configuration. Afterwards, what is the magnetic force between the two pieces?
neutral because both magnets are neutral
repelling because like poles repel
attracting because like poles attract
attracting because opposite poles attract
Two magnets are broken in half as shown. Which statement is true?
Both pairs of magnets attract each other.
The top pair of magnets attract each other while the bottom pair repels.
The bottom pair of magnets attract each other while the top pair repels.
Both pairs of magnets repel each other.
A compass is placed on top of a magnet as shown in side view. From the top view, what direction would the compass needle be pointing?
left (-x)
right (x)
up (y)
down (-y)
Two large magnets are placed near together. In between them, the compass needle points
left (-x)
right (x)
up (y)
down (-y)
Which shows the correct magnetic field?
a
b
c
d
e
Students make field lines between three bar mangets. Which two poles must the same polarity as E in order to form these field lines?
A
B
C
D
Current is carried by a long straight wire designated by the black x. What direction is the conventional current traveling?
out of the page
into the page
clockwise
counterclockwise
Current is carried by a long straight wire designated by the black x. What direction is magnetic field directed?
out of the page
into the page
clockwise
counterclockwise
A magnetic field is shown directed counterclockwise around a long, straight current-carrying wire. The wire carries current in the ________ direction.
up (y)
down (-y)
into the page (-z)
out of the page (z)
A wire carries current into the page. At point A, the magnetic field points
left (-x)
right (x)
up (y)
down (-y)
A wire carries current into the page. At point B, the magnetic field points
left (-x)
right (x)
up (y)
down (-y)
Point P has a magnetic field B. If P were moved twice as a far away while the current is halved, the resulting magnetic field would be
1/4 the strength in the same direction
1/2 the strength in the same direction
twice the strength in the same direction
four times the strength in the same direction
A long straight current-carrying wire carries current to the right. At point A, the magnetic field is directed
up (y)
down (-y)
into the page (-z)
out of the page (z)
A long straight current-carrying wire carries current to the right. Which statement is true about the field at point B?
It has the same magnitude as point A and is directed into the page (-z)
It has the same magnitude as point A and directed out of the page (z)
It has a lesser magnitude than A and is directed into the page (-z)
It has a lesser magnitude than A and is directed out of the page (z)
A long straight current-carrying wire carries current to the right. Which statement is true about the field at point C?
It has the same magnitude as point A and is directed into the page (-z)
It has the same magnitude as point A and directed out of the page (z)
It has a lesser magnitude than A and is directed into the page (-z)
It has a lesser magnitude than A and is directed out of the page (z)
A wire has conventional current directed into the page. Which is true about the direction and magnitude of the magnetic field of the points?
All points have a magnetic field that points down (-y) but all have different magnitudes.
All points have magnetic fields that point down (-y) and have the same magnitude as each other.
Some points have magnetic fields that point down (-y) and all have different magnitudes.
Some points have magnetic fields that point down (-y) and all have the same magnitude as each other.
A wire has conventional current directed into the page. Compared to point C, point A has
1/9th the field.
1/3 the field
three times the field
nine times the field
Two equal currents travel into and out of the page respectively. Along which line would the magnetic fields from each current cancel out?
line x'x
line y'y
line yA
the magnetic field does not cancel along any of these lines
Two wires carrying equal current into and out of the page respectively. Which points have net magnetic field pointing in the upwards (y) direction?
A
B
C
D
Two equal currents travel into the page. At point P, the magnetic field
points up (y)
points down (-y)
points into the page (-z)
cancels completely
Which two are true about the electromagnet?
The magnetic field points down (-y) inside the nail.
The magnetic field points up (+y) inside the nail.
The paperclips are attached to the north pole.
The paperclips are attached to the south pole.
Which of the following is true about the magnetic field formed inside the solenoid?
It points from left to right.
It points from right to left.
The left side of the solenoid is the north pole.
The right side of the solenoid is the north pole.
The distance between the Sun and Mars varies from 2.1 × 1011m to 2.5 × 1011m.
When Mars is closest to the Sun, the force of gravitational attraction between them is F.
What is the force of gravitational attraction between them when they are furthest apart?
0.71 F
0.84 F
1.2 F
1.4 F
The gravitational field strength at the surface of P is 13.4 N kg−1. What is the gravitational field strength at the surface of Q?
3.4 N kg−1
13.4 N kg−1
53.6 N kg−1
80.4 N kg−1
The gravitational potential difference between the surface of a planet and a point P, 10 m above the surface, is 8.0 J kgࢤ1. Assuming a uniform field, what is the value of the gravitational field strength in the region between the planet’s surface and P?
0.80 N kg−1
1.25 N kg−1
8.0 N kg−1
80 N kg−1
Which one of the following graphs correctly shows the relationship between the gravitational force, F, between two masses and the distance, r, between them?
A planet of mass M and radius R rotates so rapidly that loose material at the equator just remains on the surface. What is the period of rotation of the planet?
G is the universal gravitational constant.
The Earth moves around the Sun in a circular orbit with a radius of 1.5 × 108km.
What is the Earth’s approximate speed?
1.5 × 103 ms–1
5.0 × 103 ms–1
1.0 × 104 ms–1
3.0 × 104 ms–1
When a charge moves between two points in an electric field, or a mass moves between two points in a gravitational field, energy may be transferred.
Which one of the following statements is correct?
No energy is transferred when the movement is parallel to the direction of the field.
The energy transferred is independent of the path followed.
The energy transferred is independent of the start and finish points.
Energy is transferred when the movement is perpendicular to the field lines.
The gravitational field strength at the surface of the Earth is 6 times its value at the surface of the Moon. The mean density of the Moon is 0.6 times the mean density of the Earth.
What is the value of the ratio (radius of Earth/radius of Moon)?
1.8
3.6
6.0
10
A planet has a radius half the Earth’s radius and a mass a quarter of the Earth’s mass.
What is the approximate gravitational field strength on the surface of the planet?
1.6 N kg–1
5.0 N kg–1
10 N kg–1
20 N kg–1
A satellite X of mass m is in a concentric circular orbit of radius R about a planet of mass M.
What is the kinetic energy of X?
Which one of the following gives a correct unit for (g2/G)?
N m−2
N kg−1
N m
N
Which one of the following statements about gravitational potential is incorrect?
It is analogous to the electric potential at a point in an electric field.
It is equal to the gravitational potential energy of a mass of 1 kg.
It is a vector quantity.
The difference in gravitational potential between two points at different heights above the Earth depends on the position of the points.
The radius of a planet is R. The gravitational potential at the surface of the planet due to its mass is −4000 J kg−1.
What is the gravitational potential at a distance 2R from the centre of the planet?
−1000 J kg−1
−2000 J kg−1
−4000 J kg−1
−8000 J kg−1
Which of the following statements about Newton’s law of gravitation is correct?
Newton’s gravitational law explains
the origin of gravitational forces.
why a falling satellite burns up when it enters the Earth’s atmosphere
why projectiles maintain a uniform horizontal speed.
how various factors affect the gravitational force between two particles.
