Question

Dimension of a rectangular coil is $ 20cm\times 10cm $ . Number of turns in coil is 60. It is rotating in an uniform magnetic field of $ 0.5T, $ with a speed 1800 r.p.m. the maximum induced e.m.f. is:

• A. $ 98\,V $
• B. $ 110\,V $
• C. $ 113\,V $
• D. $ 118\,V $

Answer 1

Answer: (C)

Maximum induced e.m.f. $ E=N\,A\,B\,\omega $ $ =N\,A\,B\,.\,2\pi n $ $ =60\times 20\times 30\times {{10}^{-4}}\times 0.5\times 2\pi \times \frac{1800}{60} $ $ =113\,volt $