An air cored solenoid with length 20 cm, area of cross section 20 cm 2 and number of…
Physics · Class 12 · CBSE — Electromagnetic Induction
An air cored solenoid with length 20 cm, area of cross section 20 cm2 and number of turns 400 carries a current 2 A. The current is suddenly switched off within 10–3 s. The average back emf induced across the ends of the open switch in the circuit is (ignore the variation in magnetic field near the ends of the solenoid)
- 2 V
- 4 V
- 3 V
- 5 V
Answer
(B) 4 V
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