Electromagnetic Induction MCQs
1. Total number of magnetic field lines passing through an area is called
A. magnetic flux density
B. magnetic flux
C. e.m.f(Electromagnetic Force)
D. voltage
2. A consequence of motor effect is
A. e.m.f(Electro-Magnetic Force)
B. current
C. voltage
D. electromagnetic induction
3. E.M.F (Electromagnetic Force)can be induced in a circuit by
A. changing magnetic flux density
B. changing area of a circuit
C. changing the angle
D. all of the above
4. By accelerating magnet inside the coil, current in it
A. increases
B. decreases
C. remains constant
D. reverses
5. E.M.F(Electro Magnetic Force) for a coil depends upon
A. the cross sectional area and the magnitude of magnetic flux density
B. no. of turns of wire
C. both a and b
D. none of above
6. In generators, the rate of change of flux linkage is maximum when the coil is moving through the
A. vertical position
B. horizontal position
C. diagonal position
D. none of above
7. For a straight wire, induced current depends upon
A. the speed of movement of the wire
B. the length of wire
C. the magnitude of magnetic flux density
D. all of the above
8. In a transformer the core is made up of soft iron in order to pass the maximum amount of…
A. flux
B. current
C. magnetic flux
D. voltage
9. The magnitude of induced e.m.f is proportional to
A. rate of change of current
B. rate of change of voltage
C. rate of change of magnetic flux linkage
D. rate of change of resistance
10. The induced current in a coil by a magnet turns it into an
A. straight wire
B. magnet
C. ammeter
D. electromagnet
11. Moving a coil in and out of magnetic field induces
A. force
B. potential difference
C. voltage
D. electronic magnetic force
12. Currents that flow in circles inside a disc called…
A. air currents
B. circular currents
C. Eddy Currents
D. none of above