Physics Practice: Electromagnetism (Mock Test 4 - Expert Level)
1. Expert Analysis: In an AC generator, the phase difference between the magnetic flux linked with the coil and the induced e.m.f. is:
2. Clinical Logic: Why is the core of a transformer made of "Soft Iron" instead of "Steel"?
3. Data-Based: A transformer has $500$ turns in the primary and $1000$ turns in the secondary. If an AC voltage of $200 \text{ V}$ is applied to the primary, the secondary voltage will be:
4. Experimental Setup: When the speed of rotation of a generator armature is doubled, the maximum induced e.m.f. becomes:
5. Which of the following differentiates an AC generator from a DC motor in construction?
6. A transformer is used to light a $120 \text{ W, } 24 \text{ V}$ lamp from $240 \text{ V}$ AC mains. If the transformer is $100\%$ efficient, the primary current is:
7. According to Faraday's law, the magnitude of the induced e.m.f. is directly proportional to:
8. In long-distance power transmission, voltage is stepped up to very high values to:
9. "Back E.M.F." in a DC motor is produced due to:
10. Expert Logic: If the frequency of an AC supply is $50 \text{ Hz}$, how many times does the current become zero in one second?
