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WorksheetsRevision Chapter 20 Magnetic Field
Total questions: 28
Worksheet time: 25mins
When a conductor is moved to cut through the magnetic flux, an _______________ is produced.
induced current
electromotive force
electromagnetic induction
internal resistance
The production of electric current by a changing magnetic field is called ____________________________________.
induced current
electromotive force
electromagnetic induction
internal resistance
___________________rule can be used to determine the direction of the induced current produced.
Fleming's Left Hand Rule
Fleming's Right Hand Rule
Right Hand Grip Rule
In Fleming's Right Hand Rule, First finger and center finger represent
current, magnetic field
magnetic field, current
force, current
magnetic field, force
____________law states that the direction of the induced current is such that it always _______ ___ the change producing it.
Lenz's Law, oppose
Faraday's Law, oppose
Lez's Law, follow
Faraday's Law, follow
Faraday’s Law states that the magnitude of the induced e.m.f. is _________________ to the rate of change of magnetic flux linkage with the solenoid.
equal
inversely proportional
directly proportional
No EMF is induced when?
When the wire is not moving
When the wire is parallel to magnetic field direction
When no lines are cut by the wire
all of the above
The total number of magnetic field lines passing through an area is termed as?
Voltage
EMF
Magnetic flux
Magnetic flux density
Faraday's law states that𝜺=−𝑵 𝒅𝝓/𝒅𝒕 , what is the physical meaning of the equation?
The magnetic field direction is propotional to the current of loop
The induced emf is proportional to the rate change of magnetic flux
The current of circuit proportional to voltage applied in the circuit
The induced emf is not equal to change of magnetic field
How can the magnetic flux through a coil of wire be increased? Select two answers:
Increase the magnitude of the magnetic field that passes outside the loop
Increase the magnitude of the magnetic field that passes through the loop.
Increase the cross sectional area of the loop.
Orient the loop so its normal vector is perpendicular to the external magnetic field direction.
Which coil will have the largest flux?
A
B
C
D
The direction of induced current is determine by using
Fleming's Left Hand Rule
Right Hand Rule
Right Hand Grip Rule
Diagram shows a current flows into a coil.
Which of the following magnetic field around the wire is correct ?
Diagram shows magnetic field between two North poles.
Which region has a greatest strenght of magnetic field?
A
B
C
D
Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?
A
B
C
D
The nature of magnetic field line passing through the centre of current carrying circular loop is :
circular
ellipse
parabolic
straight line
Diagram shows a current–carrying conductor placed between the poles of two magnet bars. Which diagram shows the resulting magnetic field ?
The motion of a current carrying conductor in an magnetic fields can be determined by
Right hand Grip Rule
Fleming’s Right Hand Rule
Fleming’s Left Hand Rule
Direction of current flow
Diagram shows a current – carrying conductor in magnetic field. What is the direction of the force that acts on the conductor ?
A
B
C
D
A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?
zero
1.6 × 10-21 𝑁
3.2 × 10-21 𝑁
1.6 × 10-20 𝑁
3.2 × 10-20 𝑁
A proton travels at a speed of 5.0 × 107 𝑚/𝑠 through a 1.0 𝑇 magnetic field. What is the magnitude of the magnetic force which acts on the proton if the angle between the proton's velocity and the magnetic field vector is 30°?
2.0×10-14 𝑁
4.0×10-14 𝑁
2.0×10-12 𝑁
4.0×10-12 𝑁
6.0×10-12 𝑁
Uniform magnetic and electric fields exist between the two oppositely charged parallel plates shown in the figure below. An electron travels horizontally between the plates. Assuming gravitational effects to be negligible, which of the following diagrams shows a combination of electric and magnetic field directions that will allow the electron to travel un-deflected?
A beam of electrons has speed 107 𝑚/𝑠. It is desired to use the magnetic field of the Earth,
5 × 10-5 𝑇, to bend the electron beam into a circle. What will the radius of this circle be?
1 nm
1 μm
1 mm
1 m
1 km
In a certain region of space, electric field
E and magnetic field
B are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is
E/B
B/E
E x B
E.B
An electron is in a uniform magnetic field B that is directed out of the plane of the page, as shown above. When the electron is moving in the plane of the page in the direction indicated by the arrow, the force on the electron is directed
toward the right
out of the page
into the page
toward the top of the page
toward the bottom of the page
Which of the paths above represents the path of an electron traveling without any loss of energy through a uniform magnetic field directed into the page?
A
B
C
D
E
