Physics MCQs for Competitive Exams Part 4

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Question:

The instantaneous value of an AC is given by . The rms value of current is

Question:

Inductive reactance of a coil expressed as

1. Ampere
2. Ohm
3. Volt
4. Weber

Question:

The average value of alternating current over a complete cycle is

Question:

A induction may store energy in

1. Its electric field
2. Its coils
3. Its magnetic field
4. Both electric and magnetic fields

Question:

Two different coils have self-inductance . The current in both coils are increased at same constant rate. The ratio of the induced emf in the coil is

Question:

A coil of resistance 50 and inductance 4H is connected to a 10V battery. The energy stored in the coil

Question:

Two coils of self-inductance are placed close together so that effective flux in one coil is completely linked with the other. If is the mutual inductance between them, then

Question:

The instrument which works on the principle of mutual induction is

1. Galvanometer
2. Ammeter
3. Potentiometer
4. Transformer