A conducting rod of length slides on smooth parallel rails in a uniform magnetic…
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A conducting rod of length ℓ slides on smooth parallel rails in a uniform magnetic field B perpendicular to the plane of the rails. The rod starts from rest at t=0 and thereafter moves with a constant acceleration a. The total resistance of the closed circuit is R.
(a) Derive an expression for the induced emf as a function of time t.
(b) Obtain the instantaneous power dissipated in the resistor in terms of B,ℓ,a,t and R.