Question

In the figure shown, the uniform resistance wire between A and B has a
total resistance R. The contact at C can divide the wire into two resistors,
one of which is fR, Value of f for which the ammeter reading is :

diagram pic

(A) Minimum if f=0
(B) Minimum if f= 1
1
(C) Minimum if f= 1/2
1
D) Minimum if f= 1/3​

Answer 1

Answer:

minimum if f=1/2 the resistance