(B) According to Ohm's law,the ratio $V/i$ is equal to the resistance $R$ of the conductor.For a metallic wire,the resistance $R$ is given by the rela

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Increases as the temperature rises

(B) According to Ohm's law,the ratio $V/i$ is equal to the resistance $R$ of the conductor.For a metallic wire,the resistance $R$ is given by the relation $R_t = R_0(1 + \alpha \Delta T)$,where $\alpha$ is the temperature coefficient of resistance.For metals,$\alpha$ is positive,which means that as the temperature increases,the resistance $R$ of the metallic wire increases.Therefore,the ratio $V/i$ increases as the temperature rises.

Class 12 Physics Current Electricity Ohm's Law

Easy

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

A
Independent of temperature
B
Increases as the temperature rises
C
Decreases as the temperature rises
D
Increases or decreases as temperature rises,depending upon the metal

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Class 12

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Current Electricity

Subtopic

Ohm's Law

The $I-V$ graphs for two different electrical appliances $P$ and $Q$ are shown in the diagram. If $R_P$ and $R_Q$ are the resistances of the devices,then:

EasyKCET 2018

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$A$ circuit to verify $Ohm's$ law uses an ammeter and a voltmeter. How should they be connected to the resistor?

MediumJEE MAIN 2020

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What conclusion can you draw from the following observations on a resistor made of alloy manganin?
$I (A)$ $V (V)$ $I (A)$ $V (V)$
$0.2$ $3.94$ $3.0$ $59.2$
$0.4$ $7.87$ $4.0$ $78.8$
$0.6$ $11.8$ $5.0$ $98.6$
$0.8$ $15.7$ $6.0$ $118.5$
$1.0$ $19.7$ $7.0$ $138.2$
$2.0$ $39.4$ $8.0$ $158.0$

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Of the following graphs,the one that correctly represents the $I-V$ characteristics of an 'Ohmic device' is:

EasyKCET 2017

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The current in a metallic conductor is plotted against voltage at two different temperatures $T_1$ and $T_2$. Which of the following is correct?

Medium

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

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

Similar Questions

The $I-V$ graphs for two different electrical appliances $P$ and $Q$ are shown in the diagram. If $R_P$ and $R_Q$ are the resistances of the devices,then:

$A$ circuit to verify $Ohm's$ law uses an ammeter and a voltmeter. How should they be connected to the resistor?

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$

Of the following graphs,the one that correctly represents the $I-V$ characteristics of an 'Ohmic device' is:

The current in a metallic conductor is plotted against voltage at two different temperatures $T_1$ and $T_2$. Which of the following is correct?

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What conclusion can you draw from the following observations on a resistor made of alloy manganin?
$I (A)$ $V (V)$ $I (A)$ $V (V)$
$0.2$ $3.94$ $3.0$ $59.2$
$0.4$ $7.87$ $4.0$ $78.8$
$0.6$ $11.8$ $5.0$ $98.6$
$0.8$ $15.7$ $6.0$ $118.5$
$1.0$ $19.7$ $7.0$ $138.2$
$2.0$ $39.4$ $8.0$ $158.0$