SATHEE: electric-charges-and-fields Question 5

electric-charges-and-fields Question 5

Question: Q. 5. In given figure, two positive charges $q_{2}$ and $q_{3}$ fixed along the $y$ -axis, exert a net electric force in the $+ x$ direction on a charge $q_{1}$ fixed along the $x$ axis. If a positive charge $Q$ is added at $(x, 0)$ , the force on $q_{1}$

Very Short Answer Type Questions

(1 mark each)

Q. 1. A point charge $+ Q$ is placed in the vicinity of a conducting surface. Draw the electric field lines between the surface and the charge.

R [O.D. Comptt. I, II, III 2017]

[CBSE Marking Scheme, 2017]

Q. 2. Why do the electrostatic field lines not form closed loops?

U] [O.D. I, II, III 2014]

Show Answer

Solution:

Ans. Electric field lines start from positive charge and end at infinity. Therefore, these lines do not form closed loops. [CBSE Marking Scheme, 2014] 1

(a)

(b) (a) shall increase along the positive $x$ -axis.

(b) shall decrease along the positive $x$ -axis.

(d) shall increase but the direction changes because of the intersection of $Q$ with $q_{2}$ and $q_{3}$ .

[NCERT Exemp.]

Ans. Correct option:

Explanation: Net force on charge $q_{1}$ , by other charges $q_{2}$ and $q_{3}$ is along the $+ x$ -direction, so nature offorces between $q_{1}$ and $q_{2}$ and $q_{1}$ and $q_{3}$ are attractive. This is possible when charge $q_{1}$ is negative. Now, if a positive charge $Q$ is placed at $(x, 0)$ , then, the force on $q_{1}$ shall increase. Its direction will be along positive $x$ -axis.

Commonly Made Error

Some candidates do not understand about attraction and repulsion of net force. Here net force is the vector sum of all forces in $x$ -direction.

Electric Charges And Fields

electric-charges-and-fields Question 5

Very Short Answer Type Questions

Commonly Made Error

Table of Contents

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Electric Charges And Fields

electric-charges-and-fields Question 5

Very Short Answer Type Questions

Commonly Made Error

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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