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TextBook Solutions for Punjab School Education Board Class 12 Physics Physics Part I Chapter 3 Current Electricity

Question 1

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω , what is the maximum current that can be drawn from the battery?

Solution

Maximum current is drawn from a battery when the external resistance in the circuit is zero i.e., R = 0.

Given,
E.m.f of the battery,

ε = 12 V

Internal resistamce of the battery,

r = 0.4

Therefore, using the formula for maximum current drawn we get,

I_{\max} = \frac{ε}{r} = \frac{12}{0.4} = 30 A

Question 2

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A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

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Question 3

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a) Three resistors 1 Ω, 2Ω, and 3 Ω are combined in series. What is the total resistance of the combination?
b) If the combination is connected to a battery of EMF 12 V and negligible internal resistance, obtain the potential drop across each resistor.

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Question 4

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i) Three resistors 2 Ω, 4 Ω and 5 Ω are combined in parallel. What is the total resistance of the combination?

ii) If the combination is connected to a battery of emf 20 V and negligible internal resistance, determine the current through each resistor, and the total current drawn from the battery.

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Question 5

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At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature co-efficient of the material of the resistor is 1.70 x 10^–4 °C^–1.

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Question 6

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A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10^–7 m², and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

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Question 7

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A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature co-efficient of resistivity of silver.

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Question 8

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A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27.0°C? Temperature co-efficient of resistance of nichrome averaged over the temperature range involved is 1.70 x10^–4 °C^–1.

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Question 9

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(a) In a metre bridge, the balance point is found to be at 39.5 cm from the end A, when the resistor Y is of 12.5 Ω. Determine the resistance of X. Why are the connections between resistors in a Wheatstone or Meter bridge made of thick copper strips?
(b) Determine the balance point of the bridge above if X and Y are interchanged?
(c) What happens if the galvanometer and cell are interchanged at the balance point of the bridge? Would the galvanometer show any current?

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Question 10

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A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?

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TextBook Solutions for Punjab School Education Board Class 12 Physics Physics Part I Chapter 3 Current Electricity

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω , what is the maximum current that can be drawn from the battery?

A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

a) Three resistors 1 Ω, 2Ω, and 3 Ω are combined in series. What is the total resistance of the combination?
b) If the combination is connected to a battery of EMF 12 V and negligible internal resistance, obtain the potential drop across each resistor.

At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature co-efficient of the material of the resistor is 1.70 x 10^–4 °C^–1.

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10^–7 m², and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature co-efficient of resistivity of silver.

A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

For Daily Free Study Material Join wiredfaculty

WhatsApp Group

Download Android App

Ncert Book Download

TextBook Solutions for Punjab School Education Board Class 12 Physics Physics Part I Chapter 3 Current Electricity

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω , what is the maximum current that can be drawn from the battery?

A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?

a) Three resistors 1 Ω, 2Ω, and 3 Ω are combined in series. What is the total resistance of the combination?b) If the combination is connected to a battery of EMF 12 V and negligible internal resistance, obtain the potential drop across each resistor.

At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature co-efficient of the material of the resistor is 1.70 x 10–4 °C–1.

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10–7 m2, and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature co-efficient of resistivity of silver.

A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

a) Three resistors 1 Ω, 2Ω, and 3 Ω are combined in series. What is the total resistance of the combination?
b) If the combination is connected to a battery of EMF 12 V and negligible internal resistance, obtain the potential drop across each resistor.

At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to be 117 Ω, given that the temperature co-efficient of the material of the resistor is 1.70 x 10^–4 °C^–1.

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10^–7 m², and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?