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An electric dipole is placed in a uniform electric field vecE withits dipole moment vecp parallel to the field . Find (i)the work done in turningthe dipole till its dipole moment points in the direction opposite to vecE. (ii)The orientation of the dipole for which the torque acting on it become the maximum. |
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Answer» Solution :We have `W=int_(theta_(1))^(theta_(2))taud theta` `thereforeW=int_(0)^(PI)pEsinthetad theta` `=pE[-COSTHETA]` `=-2pE` (ii)`thereforetau =PESIN theta`for `theta=(pi)/(2),TAU`ismaximum Alternatively , 
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