A conducting rod of length slides without friction on two parallel conducting rails

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A conducting rod of length

0.40\,\text{m}

slides without friction on two parallel conducting rails. The rails are joined at one end by a

6.0\,\Omega

resistor, forming a closed rectangular loop. The rod moves to the right at a steady

2.5\,\text{m}\,\text{s}^{-1}

in a uniform magnetic field of

0.75\,\text{T}

directed into the page and perpendicular to the plane of the rails. Calculate the current that flows through the resistor.