Physics Practice: Electromagnetism (Mock Test 5 - Ultimate Comprehensive)
1. A magnetic field is produced around a wire only when:
2. The strength of an electromagnet can be increased by:
3. A DC motor works on the principle of:
4. Induced e.m.f. is produced in a coil when the magnetic flux linked with it ________.
5. In a transformer, the energy is transferred from primary to secondary coil through:
6. If the number of turns in the secondary of a transformer is less than that in the primary, it is a:
7. The unit of magnetic field strength (B) is:
8. AC generator uses ________ to connect the rotating coil to the external circuit.
9. Which of the following does NOT work on the principle of electromagnetism?
10. For a $100\%$ efficient transformer, the relation between current and turns is:
