A conducting rod slides with constant velocity on two rails making an angle 60° in a uniform magnetic field. If the motional emf varies as E=ctⁿ, the value of n is:

Question

G1 Physics · Accepted Answer

The rod's distance from the vertex increases linearly with time, so its length between diverging rails is also proportional to t. Motional emf E=BvL therefore E∝t. Hence n=1.