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Moving Charges and Magnetism

Total questions: 35

Worksheet time: 27mins

Name
Class
Date
1.

To convert a moving coil galvanometer into on ammeter of given range, we must connect:

a)

A suitable low resistance in series

b)

A suitable low resistance in parallel

c)

A suitable high resistance in parallel

d)

A suitable high resistance in series

2.

Current sensitivity of a galvanometer can be increased by decreasing :

a)

Magnetic field B

b)

number of turns N

c)

torsional constant K

d)

Area A

3.

An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at 20 cm from the straight wire would be

a)

B/6

b)

B/4

c)

B/3

d)

B/2

4.

A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is

a)

B

b)

2B

c)

4B

d)

8B

5.

A linear conductor carrying current if placed parallel to the direction of magnetic field, then it experiences ---------------- force.

(a)  

6.

A circular coil of radius 10 cm is placed in X - Y plane, a constant current of 10 A is flowing in it in clockwise sense. The magnitude and direction of magnetic field at the centre are

a)

2 π\pi ×\times 10^-5 T along + z axis

b)

2 π\pi ×\times 10^-5 T along −- z axis

c)

2 ×\times 10^-5 T along +z axis

d)

2 ×\times 10^-5 T along −- z axis

7.

The resistance of an ideal voltmeter should be ----

(a)  

8.

A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon

a)

area of loop

b)

value of current

c)

magnetic field

d)

None of these

9.

A solenoid has 1000 turns per meter length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is

a)

2 PIE 10-3 T

b)

2 PIE 10-5 T

c)

4 PIE 10-3 T

d)

4 PIE 10-5 T

10.

What is the equation for the force on a moving charge

a)

F=qvB

b)

F=qv/B

c)

9.8 N/kg

d)

None of the above

11.

A positive charge is moving to the left through a magnetic field that is going into the page. What is the direction of the force on the charge?

a)

Up

b)

Down

c)

Into the page

d)

Out of the page

e)

No Force

12.

A positive charge is moving to the left through a magnetic field that is coming out of the page. What is the direction of the force on the charge?

a)

Up

b)

Down

c)

Into the page

d)

Out of the page

e)

No Force

13.

A positive charge is stationary in a magnetic field that is coming out of the page. What is the direction of the force on the charge?

a)

Up

b)

Down

c)

Into the page

d)

Out of the page

e)

No Force

14.

A current (I) is moving through a wire in the upward direction through a magnetic field directed to the right. What is the direction of the force on the wire?

a)

Up

b)

Down

c)

Into the page

d)

Out of the page

e)

No Force

15.

correct unit of magnetic field is

a)

(a) Amperes

b)

(b) Tesla

c)

(c) Newton

d)

(d) coulombs ampere turns

16.

what is common to both Biot savart law and ampere's law

a)

(a) Both relate the magnetic field and the current, and both express the same physical consequences of a varying electrical current

b)

(b) Both relate the magnetic field and the current, and both express the same physical consequences of a steady electrical current

c)

(c) Both relate the magnetic field and the current density, and both express the same physical consequences of a steady electrical current

d)

(d) nothing in common

17.
If you cut a magnet in half, what happens to the poles?
a)
One half gets the North Pole, the other half gets the South Pole
b)
Both halves get only a North Pole
c)
Both halves get only a South Pole
d)
Both halves get a North pole and a South Pole
18.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
19.

The strongest part of a magnet is...

a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
20.
If you place the North pole of a magnet next to the South pole of another magnet, they will:
a)
Attract
b)
Repel
c)
Do nothing
d)
Shatter
21.

Two ways to increase the magnetic force of an electro-magnet

a)
Increase the current flow, reduce the number of coils
b)
Increase the voltage, decrease the number of coils
c)
Increase the number of coils and the current flow
d)
Spread out the coils, replace iron core with rubber.
22.

The magnetic north pole of Earth is located in the same place as the geographic north pole of Earth

a)

True

b)

False

23.

A solenoid is

a)

a coil of wire that acts like a magnet when electricity passes through it.

b)

a straight wire that acts like a magnet when electricity passes through it

c)

a coil of wire that acts like a battery when electricity passes through it.

d)

a straight wire that acts like a battery when electricity passes through it

24.
If the current is going up on the front side of the coil then what side of the electromagnet is north?
a)
Up
b)
Down
c)
Left
d)
Right
25.

Magnetic field lines can sometimes cross.

a)
True
b)
False
26.

Refer the diagram. A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

a)

Directed to the right

b)

Directed to the left

c)

Equal to the magnetic field

d)

n the same direction as the magnetic field

27.

The relative strength of the magnetic field is shown by the degree of closeness of the field lines.

a)

false

b)

true

c)

can't say

28.

Which electromagnet is the strongest?

a)
b)
c)
d)
29.

What is the direction of the magnetic field created by the wire at point P?

a)

Left

b)

Right

c)

Out of screen

d)

Into screen

e)

Up

30.
Electric motors are devices that convert _____ energy into  _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
31.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
32.
If the North Pole of a permanent magnet is placed next to a compass as seen in the picture, which direction will the needle move?
a)
Clockwise
b)
Counter-clockwise
c)
It will not move
d)
Need more information
33.
An electromagnet's poles may be reversed by:
a)
decreasing the voltage of the coil
b)
increasing the number of coils
c)
changing the direction of current flow
d)
altering the material used to make the coils
34.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
35.
How is a permanent magnet DIFFERENT from a temporary magnet?
a)
A permanent magnet attracts materials made of iron.
b)
A permanent magnet has poles.
c)
A permanent magnet has a magnetic field.
d)
A permanent magnet keeps its magnetism for a long time.

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