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 VI for his four readings, he would find that the value of this ratio :(1) for contact at point P is 14th of that for contact at point S.(2) for contact at point Q is 24th of that for contact at point S.(3) for contact at point R is 34th of that for contact at point S.(4) is the same for all the four readings

A student used the set up given here to study the dependence of curren

1.	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 VI for his four readings, he would find that the value of this ratio :(1) for contact at point P is 14th of that for contact at point S.(2) for contact at point Q is 24th of that for contact at point S.(3) for contact at point R is 34th of that for contact at point S.(4) is the same for all the four readings
Answer» 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 $\frac{V}{I}$ for his four readings, he would find that the value of this ratio : (1) for contact at point P is $\frac{1}{4} th$ of that for contact at point S. (2) for contact at point Q is $\frac{2}{4} th$ of that for contact at point S. (3) for contact at point R is $\frac{3}{4} th$ of that for contact at point S. (4) is the same for all the four readings