A metal plate of mass falls vertically through a uniform magnetic field of such that…

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

Problem

A metal plate of mass

0.20\,\text{kg}

falls vertically through a uniform magnetic field of

0.60\,\text{T}

such that the field is perpendicular to the plane of the plate. After a short time it reaches a steady terminal speed of

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

. Calculate the rate at which thermal energy is produced in the plate at terminal speed. Take

g = 9.8\,\text{m\,s}^{-2}