Electromagnetism – Online MCQs – Physics 10th

1. The turn ratio of a transformer is 10. It means:

2. Two parallel wires carrying currents in opposite directions:

3. The number of coils in a transformer is:

4. The force that attracts matter across long distances.

5. If we had a wire with the right hand such that the thumb pointed in the direction of the current, then the curling fingers of the hand will point the:

6. The step-up transformer:

7. The electric power delivered to the secondary circuit is equal to the power supplied to the primary circuit is a/an:

8. When current flowing upward direction it indicated the:

9. The induced emf of a coil is directly proportional to:

10. When the plane of the coil is parallel to magnetic field, the induced e.m.f is:

11. At the centre, the magnetic field is:

12. To increase or decrease AC voltages, we use:

13. A conductor of length L has current I passing through it when it is placed parallel to a magnetic field. The force experienced by the conductor will be:

14. The direction of induced current in a circuit is always such that it opposes the cause that produces it. This law was presented by:

15. Fleming’s left-hand rule is used to find:

16. If the secondary voltage is lower than the primary voltage, the transformer is called a:

17. When a coil rotated in a magnetic field the induced current in it:

18. It is responsible for forcing positively charged atomic nuclei to attract negatively charged electrons.

19. When electric charges are at rest, they exert:

20. The magnetic field around a magnetic moving charge is a: