A) Picture a solenoid with 3400 turns and an area of 10 cm2. A permanent magnet

Question

A) Picture a solenoid with 3400 turns and an area of 10 cm2. A permanent magnet is suddenly moved away from the solenoid and the magnetic field drops from 30 Gauss to zero in 0.1 seconds. What is the average potential difference induced between the two ends of solenoid wire due to the movement of the magnet? Your answer should be in Volts.

B) Let us assume that a permanent magnet is added to the inside a solenoid with 3400 wire turns and cross-section area of about 60 cm2 and creates magnetic field of 30 Gauss in 10 seconds. What is the potential difference induced between the two ends of solenoid wire? Your answer should be in Volts.

Explanation / Answer

(a) = Nd/ dt = NAdB/dt = (3400)(10*10-4 m^2)(30*10-4 T )/ (0.1 s)

= 0.102 V

(b)

= Nd/ dt = NAdB/dt = (3400)(60*10-4 m^2)(30*10-4 T )/ (10 s)

= 6.12*10-3 V

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