Question 11 : The total number of magnetic field lines passing through an area is termed as?
1. Voltage
2. EMF
3. Magnetic flux
4. Magnetic flux density
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Question 12 : What is the consequence of motor effect?
1. Current
2. Voltage
3. Electromagnetic induction
4. EMF
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Question 13 : What happens to the current in a coil while accelerating a magnet inside it?
1. Increases
2. Decreases
3. Remains constant
4. Reverses
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Question 14 : An E.M.F. can be induced by _________
1. Change in the magnetic field only
2. Change in the area of cross section only
3. Change in angle between magnetic field and area only
4. Change in the magnetic field, area or angle between them
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Question 15 : Force in current carrying conductor placed in magnetic field is ___________ of il and B.
1. dot product
2. scalar product
3. cross product
4. vector addition
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Question 16 : If the intensity of the magnetic field perpendicular to current carrying conductor is 100T, the length of the conductor is 3m and the current in the conductor is 10A, calculate the magnitude of force perpendicular to the electric field.
1. 300N
2. 30N
3. 30kN
4. 3kN
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Question 17 : If the intensity of the magnetic field is 100T, the length of the conductor is 10m and the magnitude of force perpendicular to the magnetic field is 10kN,calculate the current in the conductor.
1. 100 A
2. 100 mA
3. 10 A
4. 10 mA
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Question 18 : If net force is zero on a particle in magnetic field what is relation between velocity and magnetic field?
1. v=E*B
2. v=E/B
3. v=B/E
4. v=1/(E*B)
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Question 19 : The unit for force in a current carrying conductor is _________
1. Tesla*Ampere*metre
2. Tesla
3. Ampere/metre
4. Ampere*metre
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Question 20 : When the magnetic field intensity in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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