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If a charge is at point and a charge is at point , then calculate at origin.

(a)
(b)
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(d)

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Important Questions on Electric Charges and Fields
MEDIUM
NEET
IMPORTANT
The charge per unit length of the four quadrants of the ring are, , , and , respectively. What is the electric field at the centre?

EASY
NEET
IMPORTANT
A charged ball hangs from a silk thread , which makes an angle with a large charged conducting sheet , as shown in the figure. The surface charge density of the sheet is proportional to,

MEDIUM
NEET
IMPORTANT
Two point charges and are located at and , respectively. The location of a point w.r.t. charge on the -axis at which the net electric field due to these two point charges is zero is,

MEDIUM
NEET
IMPORTANT
Two equal negative charges are placed at points and on y-axis. A positive charge at rest is left to move from point . This charge will,

MEDIUM
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IMPORTANT
Two charges of equal magnitude are placed at a distance on the axis. Another charge of mass is placed mid-way between the two charges. If this charge is displaced from equilibrium state to a distance along axis, then the charge,

MEDIUM
NEET
IMPORTANT
Let be the charge density distribution for a solid sphere of radius and total charge . For a point inside the sphere at a distance from the centre of the sphere, the magnitude of electric field is,

HARD
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IMPORTANT
A thin semi-circular ring of radius has a positive charge distributed uniformly over it. The net field at the centre is,

HARD
NEET
IMPORTANT
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of with each other. When suspended in a liquid of density , the angle remains the same. If density of the material of the sphere is , the dielectric constant of the liquid is,
