The current $(I)$ and voltage $(V)$ graphs for a given metallic wire at two different temperatures $T_1$ and $T_2$ are shown in the figure. It is concluded that

$A$ solenoid is at a potential difference of $60\, V$ and the current flowing through it is $15\, A$. The resistance of the coil will be ............ $\Omega$.

For a metallic wire,the ratio $V/i$ ($V =$ the applied potential difference,$i =$ current flowing) is

The variation of current $(i)$ passing through a conductor as the voltage $(V)$ applied across its ends is varied is shown in the adjoining diagram. If the resistance $(R)$ is determined at the points $A, B, C$ and $D$,we will find that

The $V-I$ graph for a conductor at two different temperatures $T_1$ and $T_2$ is shown. The relationship between $T_1$ and $T_2$ is:

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

$I (A)$	$V (V)$	$I (A)$	$V (V)$
$0.2$	$3.94$	$3.0$	$59.2$
$0.4$	$7.87$	$4.0$	$78.8$
$0.6$	$11.8$	$5.0$	$98.6$
$0.8$	$15.7$	$6.0$	$118.5$
$1.0$	$19.7$	$7.0$	$138.2$
$2.0$	$39.4$	$8.0$	$158.0$