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Potential energy in external Electric Field

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Potential Energy of a System of Two Charges in External Field

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Potential Energy of System of Charges

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Important Questions

Derive an expression for the torque acting on an electric dipole kept in a uniform electric field and hence define electric dipole moment.

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A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge

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Derive the formula for the electric potential energy of an electric dipole in a uniform electric field.

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An electric dipole of length 2 cm, when placed with its axis making an angle of with a uniform electric field, experiences a torque of Nm. Calculate the potential energy of the dipole, if it has a charge of 4nC.

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An electric dipole of diploe moment placed in uniform electric field has maximum potential energy when angle between and

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An electric dipole of moment 'p' is placed in an electric field of intensity 'E'. The dipole acquires a position such that the axis of the dipole makes an angle 0 with the direction of the field. Assuming that the potential energy of the dipole to be zero when , the torque and the potential energy of the dipole will respectively be:

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An electric dipole of length 4cm when placed with its axis making an angle of with a uniform electric field, experience a torque of . Calculate the potential energy of the dipole of it has charge .

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An electric dipole when placed in a uniform electric field will have a minimum potential energy if the dipole moment makes the following angle with

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A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance r and then returns. If q was given a speed 2v, the closest  distance of approach would be:

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An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively:

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