The variation of the resistance of a metallic conductor with temperature is shown in Fig. State why the resistance of the conductor increases with the rise in temperature.

The resistance of a conductor increases with the rise in temperature due to the increase in collision frequency of electrons with the positive metal ions.

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12th CBSE

IMPORTANT

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The variation of the resistance of a metallic conductor with temperature is shown in Fig.

Calculate the temperature coefficient of resistance from the graph.

Important Questions on Current Electricity

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 15

The variation of the resistance of a metallic conductor with temperature is shown in Fig.

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State why the resistance of the conductor increases with the rise in temperature.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 16

The following table gives the length of three copper wires, their diameters, and the applied potential difference across their ends. Arrange the wires in increasing order according to the following:

Wire No.	Length	Diameter	Potential difference
$1$	$l$	$3 d$	$V$
$2$	$2 l$	$d$	$V$
$3$	$3 l$	$2 d$	$2 V$

The magnitude of the electric field within them.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 16

The following table gives the length of three copper wires, their diameters, and the applied potential difference across their ends. Arrange the wires in increasing order according to the following:

Wire No.	Length	Diameter	Potential difference
$1$	$l$	$3 d$	$V$
$2$	$2 l$	$d$	$V$
$3$	$3 l$	$2 d$	$2 V$

The drift speed of electrons through them.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 16

The following table gives the length of three copper wires, their diameters, and the applied potential difference across their ends. Arrange the wires in increasing order according to the following:

Wire No.	Length	Diameter	Potential difference
$1$	$l$	$3 d$	$V$
$2$	$2 l$	$d$	$V$
$3$	$3 l$	$2 d$	$2 V$

The current density within them.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 17

Two metallic wires,

P_{1}

and

P_{2}

of the same material and same length but different cross-sectional areas,

A_{1}

and

A_{2}

are joined together and connected to a source of emf. Find the ratio of the drift velocities of free electrons in the two wires when they are connected in series.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 17

Two metallic wires,

P_{1}

and

P_{2}

of the same material and same length but different cross-sectional areas,

A_{1}

and

A_{2}

are joined together and connected to a source of emf. Find the ratio of the drift velocities of free electrons in the two wires when they are connected in parallel.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 18

Three materials

A

B

and

C

have electrical conductivities

σ

2 σ

and

2 σ

respectively. Their number densities of free electrons are

n

2 n

and

n

respectively. For which material, is the average collision time of free electrons maximum?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 19

A battery of emf

ε

and internal resistance

r

sends currents

I_{1}

and

I_{2}

, when connected to external resistances

R_{1}

and

R_{2}

respectively. Find the emf and the internal resistance of the battery.

The variation of the resistance of a metallic conductor with temperature is shown in Fig. Calculate the temperature coefficient of resistance from the graph.

Important Questions on Current Electricity

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The variation of the resistance of a metallic conductor with temperature is shown in Fig.

Calculate the temperature coefficient of resistance from the graph.