The $V-I$ graphs for two resistors of the same material and the same radii with lengths $L_{1}$ and $L_{2}$ are shown below. If $L_{1}>L_{2}$, state with reason, which of these graphs represents voltage-current change for $L_{1}$.
The $V-I$ graphs for two resistors of the same material and the same radii with lengths $L_{1}$ and $L_{2}$ are shown below. If $L_{1}>L_{2}$, state with reason, which of these graphs represents voltage-current change for $L_{1}$.
As $L_{1}>L_{2}$ so $R_{1}>R_{2} .$ Now, slope of graph $B$ is more than that of graph $A$. Therefore, resistance of graph $B$ is more than that of graph
$A.$ Hence, graph $B$ represents voltage-current change for length, greater length for the same area of cross-section. Hence, graph $B$ corresponds to length $L_{1}$.
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The electrical resistivity of few materials is given below in ohm-metre. Which of these materials can be used for making element of a heating device ?
$A$
$6.84 \times 10^{-8}\, \Omega m$
$B$
$1.60 \times 10^{-8}\, \Omega m$
$C$
$1.00 \times 10^{-4}\, \Omega m$
$D$
$2.50 \times 10^{12}\, \Omega m$
$E$
$4.40 \times 10^{-5}\, \Omega m$
$F$
$2.30 \times 10^{17}\, \Omega m$
The electrical resistivity of few materials is given below in ohm-metre. Which of these materials can be used for making element of a heating device ?
| $A$ | $6.84 \times 10^{-8}\, \Omega m$ |
| $B$ | $1.60 \times 10^{-8}\, \Omega m$ |
| $C$ | $1.00 \times 10^{-4}\, \Omega m$ |
| $D$ | $2.50 \times 10^{12}\, \Omega m$ |
| $E$ | $4.40 \times 10^{-5}\, \Omega m$ |
| $F$ | $2.30 \times 10^{17}\, \Omega m$ |