Motional EMF Video Lessons

Concept

# Problem: Consider a conducting rod of length 28 cm moving along a pair of rails, and a magnetic field pointing perpendicular to the plane of the rails.At what speed (in m/s) must the sliding rod move to produce an emf of 0.75 V in a 1.75 T field?

###### FREE Expert Solution

The induced emf:

$\overline{){\mathbf{\epsilon }}{\mathbf{=}}{\mathbf{B}}{\mathbf{l}}{\mathbf{v}}}$, where B is the magnetic field, l is the length of the rod, and v is the velocity of the rod.

93% (99 ratings)
###### Problem Details

Consider a conducting rod of length 28 cm moving along a pair of rails, and a magnetic field pointing perpendicular to the plane of the rails.

At what speed (in m/s) must the sliding rod move to produce an emf of 0.75 V in a 1.75 T field?