Question:

The average current in the steady state registered by the ammeter in the circuit will be proportional to the potential V0, zero, proportional to V1/20, or proportional to V20?

proportional toV20

zero

proportional toV1/20

proportional to the potentialV0

Since u=0, h=1/2at^2, t=√(2hm/qE) = √(2mh/qΔV). E=V0/h, =q/t = q/√(2mh/qV0) = q√(qV0/2mh). As q∝V0, ∝√(V0^2) = V0. ∝V20. Answer is option A.