A horizontal wire long is falling at a speed of perpendicular to a uniform magnetic…

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

Problem

A horizontal wire

0.8\ \text{m}

long is falling at a speed of

5\ \text{m s}^{-1}

perpendicular to a uniform magnetic field of

1.1\ \text{T}

, directed from east to west. Calculate the magnitude of the induced emf. Is the north or south end of the wire positive?