Question

The length of side of a square coil is 50 cm and number of turns in it is 100. If it is placed at right angles to a magnetic field which is changing at the rate of 4 Tesla/s, then induced emf in the coil will be :

• A. 0.1 V
• B. 1.0 V
• C. 10 V
• D. 100 V

Answer 1

The correct option is D 100 V

emf =|e|= $\frac{d\varphi }{dt}$=NA$\frac{dB}{dt}$

rate of change of flux = $N\times area\times$ rate of change of magnetic field = $100\times {0.5}^2\times 4=100V$