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(B) The dipole moment $p$ is given by $p = q 	imes (2a)$,where $q = 1 \,\mu C = 10^{-6} \,C$ and the separation distance $2a = 2 \,cm = 2 	imes 10^{

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$2 	imes 10^{-3}$

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(B) The dipole moment $p$ is given by $p = q 	imes (2a)$,where $q = 1 \,\mu C = 10^{-6} \,C$ and the separation distance $2a = 2 \,cm = 2 	imes 10^{-2} \,m$.So,$p = (10^{-6} \,C) 	imes (2 	imes 10^{-2} \,m) = 2 	imes 10^{-8} \,Cm$.The torque $	au$ on a dipole in an external electric field $E$ is given by $	au = pE \sin 	heta$.The maximum torque occurs when $	heta = 90^{\circ}$,so $	au_{\max} = pE$.Given $E = 10^5 \,N/C$,we have $	au_{\max} = (2 	imes 10^{-8} \,Cm) 	imes (10^5 \,N/C) = 2 	imes 10^{-3} \,Nm$.

An electric dipole consists of two opposite charges each of magnitude $1 \,\mu C$ separated by a distance of $2 \,cm$. The dipole is placed in an external field of $10^5 \,N/C$. The maximum torque on the dipole is ......... $Nm$.

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