Question

A sample of HCI gas is placed in an electric field of 2.5 × 10⁴ NC⁻¹. The dipole moment of each HCI molecule is 3.4 × 10⁻³⁰ Cm. Find the maximum torque that can act on a molecule. 

Answer 1

Given:
Electric field intensity, E = 2.5 × 10⁴ NC⁻¹
Dipole moment of an HCl molecule, P = 3.4 × 10⁻³⁰ Cm
Torque on the molecule, 

$$\mathrm{\Gamma }=PE\sin \theta$$

For

$${\mathrm{\Gamma }}_{max}$$ , putting sinθ = 1, we get

$${\mathrm{\Gamma }}_{max}=PE$$ 

$$=3.4\times {10}^{-30}2.5\times {10}^4$$ 

$$=8.5\times {10}^{-26}$$  Nm