SATHEE: electric-charges-and-fields Question 5

विद्युत आवेश और क्षेत्र

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.

विद्युत आवेश और क्षेत्र

Very Short Answer Type Questions

Commonly Made Error

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एनसीईआरटी व्यायाम वीडियो समाधान

विद्युत आवेश और क्षेत्र

Very Short Answer Type Questions

Commonly Made Error

विषयसूची

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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