Motional EMF -- problem 7.7 in Griffith

[Pushoam]

Homework Statement

I need help in solving (c) and (d).

Homework Equations

The Attempt at a Solution

Since the force acting on the bar is Magnetic force and magnetic force does no work, the speed of the bar will remain same i.e. v₀.
Question (d) is not making sense to me.

 

[cnh1995]

Since the force acting on the bar is Magnetic force and magnetic force does no work, the speed of the bar will remain same i.e. v0.

Energy is being dissipated in the resistor. Where is this energy coming from?

 

[rude man]

Question (d) is not making sense to me.

Compute the energy dissipated in the resistor as ∫i²R dt.