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 .

Potentials at both the points P and Q are positive. P is nearer to the source charge than Q . Also, we know that the electrostatic potential at a point is inversely proportional to the distance of the point from the charge i.e. V ∝ 1 r , therefore V P > V Q or V P - V Q > 0 Potentials at both the points A and B are negative. Point B is farther from the charge than the point A . So, potential at B is less negative than at A . ∴ V B > V A or V B - V A > 0

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.

EASY

12th CBSE

IMPORTANT

Earn 100

Why is there loss of energy when two charged conductors at different potentials are connected by a conducting wire?

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>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 64

During lightning, it is safest to sit inside a car rather than near a tree. Why?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 65

Is there some way of producing high voltage on your body without getting a shock?

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12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 2 - Electrostatic Potential and Capacitance>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 66

Two metallic spheres of radii

R

and

2 R

are charged so that both of these have same surface charge density

α

. If they are connected to each other with a conducting wire, in which direction will the charge flow and why?

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

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

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 $A$ ?

Why is there loss of energy when two charged conductors at different potentials are connected by a conducting wire?

Important Questions on Electrostatic Potential and Capacitance

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