An electric dipole consisting of two opposite charges of 2 x 10-6 C each separated by a distance of 3 cm is placed in an electric field of 2 x 105 N/C. The maximum torque on the dipole will be

An electric dipole consisting of two opposite charges of $2 x 10^{- 6}$ C each separated by a distance of 3 cm is placed in an electric field of $2 x 10^{5}$ N/C. The maximum torque on the dipole will be

A
$12 \times 10^{- 1} N m$
B
$12 \times 10^{- 3} Nm$
C
$24 \times 10^{- 1} N m$
D
$24 \times 10^{- 3} N m$

Solution:

Maximum torque= pE

$= 2 \times 10^{- 6} \times 3 \times 10^{- 2} \times 2 \times 10^{5} = 12 \times 10^{- 3} N - m$

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