CBSE Class 12 Physics 2023 Delhi Set 1 Paper

Question : 1

Total: 35

SECTION - A

An electric dipole of length 2‌cm is placed at an angle of 30∘ with an electric field 2×105N∕C. If the dipole experiences a torque of 8×10−3‌Nm, the magnitude of either charge of the dipole, is

4µC
7µC
8‌mC
2‌mC

Solution: 👈: Video Solution

‌θ=30∘
‌E=2×105N∕C
τ‌=8×10−3‌Nm
l‌=2‌cm=2×10−2m
τ‌=pEsin‌θ‌‌‌‌[p=ql]
∴ τ‌=qIEsin‌θ‌‌
Or, q‌=‌

lEsin‌θ

Or, q‌=‌

8×10−3

2×10−2×2×105×sin‌30∘

∴ q‌=4µC

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