Figures below (a) and (b) show the field lines of a single positive and negative charge respectively. Give the sign of the potential energy difference of a small negative charge between the points Q and P ; A and B .

P.E. of two point charges, U = 1 4 π ε 0 ⋅ q 1 q 2 r The P.E. of a positive charge and a negative charge is negative. The potential energy of a negative charge will be more negative at P than at Q so P . E Q − P . E P > 0 The P.E. of two negative charges is positive. So the P.E. of a negative charge will be more positive at A than at B , hence P . E . A - P . E . B > 0

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively. Give the sign of the work done by the field in moving a small positive charge from Q to P .

As V P > V Q , if a small positive charge is moved by an external agency from Q to P , the work done well be positive. The work done by the electric field in moving a small positive charge from Q to P will be negative.

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively. Give the sign of the work done by an external agency in moving a small negative charge from B to A .

The negative charge will experience less repulsion at B than at A , so the work done by the external agency in moving a negative charge from B to A is positive.

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively. Does the kinetic energy of a small negative charge increase or decrease in going from B to A ?

As the negative charge moves from B to A , it experiences more repulsion, its velocity decreases, and so its kinetic energy decreases.

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12th CBSE

IMPORTANT

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Figures below (a) and (b) show the field lines of a single positive and negative charge respectively.

Give the signs of the potential differences, $V_{P} - V_{Q}; V_{B} - V_{A}$ .

Important Questions on Electrostatic Potential and Capacitance

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 1

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively.

Question Image

Give the sign of the potential energy difference of a small negative charge between the points $Q$ and $P$ ; $A$ and $B$ .

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 1

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively.

Question Image

Give the sign of the work done by the field in moving a small positive charge from $Q$ to $P$ .

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 1

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively.

Question Image

Give the sign of the work done by an external agency in moving a small negative charge from $B$ to $A$ .

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 1

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively.

Question Image

Does the kinetic energy of a small negative charge increase or decrease in going from $B$ to $A$ ?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 2

A comb run through one's dry hair attracts small bits of paper. Why? What happens if the hair is wet or if it is a rainy day?

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 2

Ordinary rubber is an insulator. But the special rubber tyres of aircraft are made slightly conducting. Why is this necessary?

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 2

Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion. Why?

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 2

A bird perches on a bare high power line and nothing happens to the bird. A man standing on the ground touches the same line and gets a fatal shock. Why?

Figures below (a) and (b) show the field lines of a single positive and negative charge respectively. Give the signs of the potential differences, VP-VQ; VB-VA.

Important Questions on Electrostatic Potential and Capacitance

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Figures below (a) and (b) show the field lines of a single positive and negative charge respectively.

Give the signs of the potential differences, $V_{P} - V_{Q}; V_{B} - V_{A}$ .