A student used the set up given here to study the dependence of current (I) on the potential difference (V) across a resistor.
He kept the contact C in four different positions marked as P,Q,R and S in the figure. On calculating the values of the ratio `(V)/(I)` for his four readings, he would find that the value of this ratio :

Options

A. for contact at point P is `(1)/(4)th` of that of contact at point S.
B. for contact at point Q is `(2)/(4)th` of that for contact at point S.
C. for contact at point R is `(3)/(4)th` of that for contact at point S.
D. is the same for all the four readings

Answer

D

Explanation

NA