An electric dipole, of length 2 c m , is placed with its axis making an angle 30 ° with a uniform electric field. If it experiences a torque of 10 3 N m , then potential energy of the dipole is

Question

An electric dipole, of length 2 c m , is placed with its axis making an angle 30 ° with a uniform electric field. If it experiences a torque of 10 3 N m , then potential energy of the dipole is, – 10 J, – 20 J, – 30 J, – 40 J

MARKS App · Accepted Answer

τ = P E s i n 30 10 3 = P E 2 P E = 20 3 Potential energy = – P E c o s 30 potential energy = – 20 3 × 3 2 = – 10 × 3 = – 30 J

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