CBSE Class 12 Physics Chapter-6 Important Questions – Free PDF Download
Free PDF download of Important Questions with Answers for CBSE Class 12 Physics Chapter 6 – Electromagnetic Induction 1 Mark Questions prepared by expert Physics teachers from latest edition of CBSE(NCERT) books only by CoolGyan to score more marks in CBSE board examination.
CBSE Class 12 Physics Chapter-6 – Electromagnetic Induction
CBSE Class 12 Physics Important Questions Chapter 6 – Electromagnetic Induction
1 Mark Questions
1. A metallic wire coil is stationary in a non – uniform magnetic field. What is the emf. Induced in the coil?
Ans. NO emf is induced in the coil as there is no change in the magnetic flux linked with the secondary coil.
2. Why does metallic piece becomes very hot when it is surrounded by a coil carrying high frequency (H.F) alternating current?
Ans. When a metallic piece is surrounded by a coil carrying high frequency (H.F) alternating current, it becomes hot because eddy currents are produced which in turn produces joule’s heating effect.
3. An electrical element X when connected to an alternating voltage source has current through it leading the voltage by 
radian. Identify X and write expression for its reactance?
Ans. X is a purely capacitive circuit
4. A transformer steps up 220 V to2200 V. What is the transformation ratio?
Ans. 
5. The induced emf is also called back emf. Why?
Ans. it is because induced emf produced in a circuit always opposes the cause which produces it.
6. Why the oscillations of a copper disc in a magnetic field are lightly damped?
Ans. Copper disc oscillates because of the production of eddy currents which opposes its oscillating motion and as a result the motion gets damped.
7.A metallic wire coil is stationary in a non – uniform magnetic field. What is the emf. Induced in the coil?
Ans.NO emf is induced in the coil as there is no change in the magnetic flux linked with the secondary coil.
