A dipole with two electric charges of 
magnitude each, with separation distance 0.5 
, is placed between the plates of a capacitor such that its axis is parallel to an electric field established between the plates when a potential difference of 5 V is applied. Separation between the plates is 0.5 mm. If the dipole is rotated by 
from the axis, it tends to realign in the direction due to a torque. The value of torque is:
Text Solution
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Given:
Potential difference 
Separation between the plates
The electric field 
is calculated as:
The torque 
experienced by the dipole in the electric field is given by:
Where:
P is the dipole moment,
E is the electric field,
The dipole moment P is calculated by:
Substituting the values into the torque equation:
Since 
, the torque simplifies to:
Thus, the torque is 
.
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