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12th CBSE
IMPORTANT
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The electrostatic force between two charges is a central force. Why?

Important Questions on Electric Charges and Field

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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 24
How is the Coulomb force between two charges affected by the presence of a third charge?
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 25
Two equal balls having equal positive charge 'q' coulombs are suspended by two insulating strings of equal length. What would be the effect on the force when a plastic sheet is inserted between the two?
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 26
Force between two point charges kept at a distance d apart in air is F. If these charges are kept at the same distance in water, how does the electric force between them change?
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 27
The dielectric constant of water is 80. What is its permittivity?
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 28
Give an example to illustrate that electrostatic forces are much stronger than gravitational forces.
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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 29

Two electrically charged particles, having charges of different magnitude when placed at a distance 'd' from each other, experience a force of attraction 'F'. These two particles are put in contact and again placed at the same distance from each other.

What is the nature of new force between them?

Is the magnitude of the force of interaction between them now more or less than F?

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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 30

An electron moves along a metal tube with variable cross-section, as shown in Figure. How will its velocity change when it approaches the neck of the tube?

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12th CBSE
IMPORTANT
New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>VERY SHORT ANSWER CONCEPTUAL PROBLEMS>Q 31
Why should a test charge be of negligibly small magnitude?