EASY
12th CBSE
IMPORTANT
Earn 100
How is the Coulomb force between two charges affected by the presence of a third charge?
Important Questions on Electric Charges and Field
EASY
12th CBSE
IMPORTANT
Two equal balls having equal positive charge '' 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?
EASY
12th CBSE
IMPORTANT
Force between two point charges kept at a distance apart in air is . If these charges are kept at the same distance in water, how does the electric force between them change?
EASY
12th CBSE
IMPORTANT
The dielectric constant of water is . What is its permittivity?
EASY
12th CBSE
IMPORTANT
Give an example to illustrate that electrostatic forces are much stronger than gravitational forces.
EASY
12th CBSE
IMPORTANT
Two electrically charged particles, having charges of different magnitude when placed at a distance '' from each other, experience a force of attraction ''. 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 ?
EASY
12th CBSE
IMPORTANT
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?
EASY
12th CBSE
IMPORTANT
Why should a test charge be of negligibly small magnitude?
EASY
12th CBSE
IMPORTANT
In defining electric field due to a point charge, the test charge has to be vanishingly small. How this condition can be justified when we know that charge less than that on an electron or a proton is not possible?
