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

12 \times 10^{- 1} N m

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12 \times 10^{- 3} N m

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24 \times 10^{- 1} N m

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24 \times 10^{- 3} N m

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Solution

The correct option is B $12 \times 10^{- 3} N m$
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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