Consider a simple circuit shown in Fig. 2(ET).2. stands for a variable resistance R'.R' can vary from `R_(0)` to infinity. r is internal resistance of the battery `(rltltRltltlR_(0))`

Options

A. Potential drop across AB is nearly constant as R' is varied
B. Current through R' is nearly a constant as R' is varied
C. Current I depends sensitively on R'
D. `I ge (V)/(r+R)` always.

Answer

A, D

Explanation

Here, the potential drop is taking place across AB and r. Since the equivalent resistance of parallel combination of R and R' is always less than R, therefore `I ge (V)/(r+R)` always.