The value of current I in the electrical circuit as given below, when potential at A is equal to the potential at B, will be _______ A.

A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field B exists into the page. The bar starts to move from the vertex at time t = 0 with a constant velocity. If the induced EMF is E ∝ tⁿ, then value of n is _________.