Question

A 15-turn circular wire loop with a radius of 3.0 cm is initially in a uniform magnetic field with a strength of 0.5 T. The field decreases to zero over a time of 0.10 sec. What is the induced emf?a. 0.21 Vb. 7.1 Vc. 0.01 Vd. 0.2.25 V

Answer 1

To solve this problem it is necessary to apply the definition given in Faraday's law in a solenoid for which it is noted that

`\epsilon = - d(\phi_B)/(dt)`

`\epsilon = -NA(dB)/(dt)`

Where,

N = Number of loops

A = Cross sectional Area

B = Magnetic Field

`\epsilon = (15)(\pi(0.03)^2)(0-0.5)/(0.1)`

`\epsilon = 0.212V`

`\epsilon = 0.21V`

Therefore the correct answer is A.