Numerical
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.
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Solution
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,
\[\Gamma = PE\sin\theta\]
For
\[\Gamma_{max}\] , putting sinθ = 1, we get
\[\Gamma_{max} = PE\]
\[ = 3 . 4 \times {10}^{- 30} 2 . 5 \times {10}^4 \]
\[ = 8 . 5 \times {10}^{- 26} \] Nm
Concept: Electric Dipole
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