An air cored solenoid of length 50 cm and area of cross section `20 m^(2)` has 200 turns and carries a current of 5.0 A. On switching off, the current decreases to across the ends of the solenoid.

An air cored solenoid of length 50 cm and area of cross section 28 m^(2) has 200 turns and carries a current of 5.0 A. On switching off, the current decreases to across the ends of the solenoid. Find flux and emf induced if time is equal to 1.0 ms.

An air-cored solenoid of length 50cm and area of cross-sectional 28 cm^(2) has 200 turns and carries a current of 5.0 A. On switching off, the current decreases to zero within a time interval of 1.0 ms. Find the average emf induced across the ends of the open switch in the circuit.

An air cored solenoid with length 30 cm , area of cross section 25 cm ^2 and number of turns 500 carries a current of 2.5 A. The current is suddenly switched off in a brief time of 10 ^(-3)s . What is the average back emf induced across the ends of the open switch in the circuit ?

An air cored solenoid with length 30 cm, area of cross-section 25 cm^(2) and number of turns 500 carries a current of 2.5 A . The current is suddenly switched off in a brief time of 10^(-3) s. How much is the average back e.m.f. induced across the ends of the open switch in the cuicuit ? Ignore the variation in magnetic field near the ends of the solenoid.

An air cored solenoid with length 30 cm, area of cross-section 25 cm^(2) and number of turns 500 carries a current of 2.5 A . The current is suddenly switched off in a brief time of 10^(-3) s. How much is the average back e.m.f. induced across the ends of the open switch in the circuit ? Ignore the variation in magnetic field near the ends of the solenoid.

An air-cored solenoid with length 30 cm, area of cross-section 25 cm2 and number of turns 800, carries a current of 2.5 A. The current is suddenly switched off in a brief time of 10-3s. Ignoring the variation in magnetic field near the ends of the solenoid, the average back emf induced across the ends of the open switch in the circuit would be