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Physics · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 3 · Q5
An electric dipole with dipole moment P =(2 · 54 × 10^-28 C. m )(2 · 00 i +3 · 00 j ) is placed in an electric field E =(1000 N/C) i. An external…
An electric dipole with dipole moment $\displaystyle \overrightarrow{\mathrm{P}}=\left(2 \cdot 54 \times 10^{-28} \mathrm{C} . \mathrm{m}\right)(2 \cdot 00 \hat{\mathrm{i}}+3 \cdot 00 \hat{\mathrm{j}})$ is placed in an electric field $\displaystyle \overrightarrow{\mathrm{E}}=\left(1000 \frac{\mathrm{~N}}{\mathrm{C}}\right) \hat{\mathrm{i}}$. An external agent turns the dipole until its electric dipole moment is $\displaystyle \overrightarrow{\mathrm{P}}=\left(2 \cdot 54 \times 10^{-28} \mathrm{C} . \mathrm{m}\right)(-3 \cdot 00 \hat{\mathrm{i}}+2 \cdot 00 \hat{\mathrm{j}})$. The work done by the agent is :
Official answer
(B)
$\displaystyle 1.27 \times 10^{-24} \mathrm{~J}$
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