An electric dipole consists of two opposite charges each 1μC separated by 2 cm. The dipole is placed

Question

An electric dipole consists of two opposite charges each 1μC separated by 2 cm. The dipole is placed in an external uniform field $E=5 	imes 10^5 N/C$. The maximum torque exerted by the field on the dipole is

Professor PC Thomas Classes · Answer

Dipole moment $p = qd = 1 	imes 10^{-6} 	imes 2 	imes 10^{-2} = 2 	imes 10^{-8}$ Cm. Maximum torque $	au_{max} = pE = 2 	imes 10^{-8} 	imes 5 	imes 10^5 = 10^{-2}$ Nm.