Q: An electric dipole consists of two opposite charges, each of magnitude 1.0μC separated by a distance of 2.0 cm. The dipole is placed in an external electric field of 10^5 N/C. The maximum torque on the dipole is:

Question:

An electric dipole consists of two opposite charges, each of magnitude 1.0μC separated by a distance of 2.0 cm. The dipole is placed in an external electric field of 10^5 N/C. The maximum torque on the dipole is:

Options:

Options:

(A) point charge.

(B) Infinite uniform line charge

(C) uniformly charged infinite plane.

(D) uniformly charged spherical shell.

Answer:

Answer:

(C) uniformly charged infinite plane.

The uniformly charged infinite plane or parallel configuration produces a uniform electric field.

Solution:

Given:

q (charges magnitude in Coulomb) = 10-6 C

d (Distance between charges in Meter) = 2  × 10-2 m.

E (electric field) = 105 N/C

Calculations:

p = q × d = 10-6 × (2  × 10-2)

= 2  × 10-8 Cm.

Τmax = pE = (2  × 10-8 )× 105

= 2  × 10-3 Nm

Here option (C) is correct which is 2 × 10-3 N-m.

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