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Two short electric dipoles are placed as shown (r is the distance between their centre). The energy of electric interaction between these dipoles will be

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(C is centre of dipole of moment P2)

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Important Questions on Electrostatics

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 10

A charge q is placed at the centre of the cubical vessel (with one face open) as shown in the figure. The flux of the electric field through the surface of the vessel is

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 11
The electric field above a uniformly charged nonconducting sheet is E. If the nonconducting sheet is now replaced by a conducting sheet with the charge same as before, the new electric field at the same point is:
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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 12

A dipole having a dipole moment p is placed in front of a solid uncharged conducting sphere as shown in the diagram. The net potential at the point A lying on the surface of the sphere is:

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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 13
The net charge given to an isolated conducting solid sphere:
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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 14
The net charge is given to a solid insulating sphere:
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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 15
A charge Q is kept at the centre of a conducting sphere of inner radius R1 and outer radius R2. A point charge q is kept at a distance r(>R2) from the centre. If q experiences an electrostatic force of 10 N, then assuming that no other charges are present, the electrostatic force experienced by Q will be:
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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 16
Two uniformly charged non-conducting hemispherical shells each having uniform charge density σ and radius R form a complete sphere (not stuck together) and surround a concentric spherical conducting shell of radius R2. If hemispherical parts are in equilibrium then minimum surface charge density of inner conducting shell is:
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Alpha Question Bank for Engineering: Physics>Chapter 22 - Electrostatics>Exercise - 2>Q 17
A solid metallic sphere has a charge + 3Q . Concentric with this sphere is a conducting spherical shell having charge −Q . The radius of the sphere is a and that of the spherical shell is b(b>a) . What is the electric field at a distance R(a<R<b) from the centre?