The figure shows a right angled isosceles triangle wire frame. The wire frame starts entering into the region of uniform magnetic field with constant velocity `v` at `t=0`. If I is the instantaneous current through the frame, then choose the corrent graph between I `&` t.

Options

A.
B.
C.
D.

Answer

D

Explanation

Hint `:` At any time `t`, the situation is as shown in figure. In this situation emf developed in the frame is , `e=Bvxx2 v t`

`I=(e)/(R)=(2Bv^(2)t)/(R)`, where R is the resistance of loop. The above expression is valid only for `tle(a)/(sqrt(2)v)`