A rectangular coil of length l = 20 cm and width w = 15 cm is moving at a constant speed v = 5 m/s.It enters a region of uniform magnetic field B = 0.2 T from the left.While the coil is completely immersed in the field,the voltage across points a and b is
A)0.20 V
B)0.15 V
C)-0.20 V
D)-0.15 V
E)zero

Question

Quizplus · Accepted Answer

When the coil is completely immersed in the magnetic field and moving at a constant speed, there is no change in the magnetic flux through the coil. Therefore, according to Faraday's law of electromagnetic induction, the induced voltage (emf) is zero because it is proportional to the rate of change of magnetic flux, which is zero in this case.

A Rectangular Coil of Length L = 20 Cm and Width