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Electrostatic Potential and Capacitance
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Potential Energy in an External Field
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Potential energy in external Electric Fi...
Potential energy in external Electric Field
7 Mins
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Potential Energy of a System of Two Charges in External Field
Example
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Potential Energy of System of Charges
Example
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QUICK SUMMARY WITH STORIES
Potential energy in external Electric Field
2 mins
Potential Energy of a System of Two Charges in External Field
2 mins
Potential Energy of System of Charges
4 mins
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.
Hard
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>
Derive the formula for the electric potential energy of an electric dipole in a uniform electric field.
Hard
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>
A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge
Medium
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>
An electric dipole of length
4cm
when placed with its axis making an angle of
$60_{∘}$
with a uniform electric field, experience a torque of
$43 N−m$
. Calculate the potential energy of the dipole of it has charge
$±8nC$
.
Medium
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>
An electric dipole of length 2 cm, when placed with its axis making an angle of
$60_{o}$
with a uniform electric field, experiences a torque of
$83 $
Nm. Calculate the potential energy of the dipole, if it has a charge of
$±$
4nC.
Medium
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>
An electric dipole of diploe moment
$p $
placed in uniform electric field
$E$
has maximum potential energy when angle between
$p $
and
$E$
Medium
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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:
Hard
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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
$θ=90_{0}$
, the torque and the potential energy of the dipole will respectively be:
Medium
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An electric dipole when placed in a uniform electric field
$E$
will have a minimum potential energy if the dipole moment makes the following angle with
$E$
Medium
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>
A particle of mass
$10_{−3}kg$
and charge
$5μC$
is thrown at a speed
$20ms_{−1}$
against a uniform electric field of strength
$2×10_{5}NC_{−1}$
. How much distance will it travel before coming to rest momentarily?
Hard
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>