A 400 turn coil of resistance 5 ohms encloses an area of 30 sqcm. How rapidly sh

Question

A 400 turn coil of resistance 5 ohms encloses an area of 30 sqcm. How rapidly should a magnetic field parallel to the coil axischange in order to induce a current of 0.3 a in the coil? a. 0.05 ts b. 0.25 T/S c. 0.8 T/S d. 1.25 T/S Can someone show me the steps? A 400 turn coil of resistance 5 ohms encloses an area of 30 sqcm. How rapidly should a magnetic field parallel to the coil axischange in order to induce a current of 0.3 a in the coil? a. 0.05 ts b. 0.25 T/S c. 0.8 T/S d. 1.25 T/S Can someone show me the steps?

Explanation / Answer

We have the formula for the induced emf is givenby           = NA (dB/dt)       IR =  NA(dB/dt) dB/dt = IR /(NA) Here I = 0.3A           R = 5            N= 400              A = 30*10-4 m2 On substitution           dB/dt = 1.25 T/s On substitution           dB/dt = 1.25 T/s

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