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## Homework Statement

mass=m

length=l

initialspeed=v0

magneticfield=B

Resistor=R

## Homework Equations

A metal rod of mass m and length l slides on two parallell frictionless rails.

A uniform magnetic field is directed perpendicular to the plane of the rails.

There is no external agent applying a force to the rod.

Show that v(t) = v0e^t/T

where T = mR/(Bl)²

## The Attempt at a Solution

I dont know where to start. Shall I construct a differentialequation including dt and dA? If not the solution I would be greatful for some hints.