COMEDK2015PhysicsElectrostatics
An electric dipole consists of two opposite charges, each of magnitude 1.0 C separated by a distance of 2.0 ~cm . The dipole is placed in an external field of 10⁵ NC ⁻¹ . The maximum torque on the dipole is
Options
- A0.2 10⁻³ ~N - m
- B1 10⁻³ ~N - m
- C2 10⁻³ ~N - m
- D4 10⁻³ ~N - m
Correct answer
C. 2 10⁻³ ~N - m
Step-by-step solution
aligned |q₁ | &= |q₂ |=1 C =10⁻⁶ C 2 l=2 ~cm =2 10⁻² ~m E=10⁵ NC ⁻¹ Maximum torque, _ &=p E 90^ &=p E=q(2 l ) E &=10⁻⁶ 2 10⁻² 10⁵ &=2 10⁻³ ~N - m aligned