An electric dipole moment p is held in a uniform electric field E.Find translation force acts on the dipole.

1 N

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0 N

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4 N

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7 N

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Solution

The correct option is B 0 N
$f_{1} = q E$ (along E)
force on $- q$ charge
$f_{2} = - q E$ (opposite to E)
$∴$ Net force on dipole
$f_{n e t} = f_{1} + f_{2} = e E + (- q E) = 0 F_{n e t} = 0$
Net translating dipole $= 0$

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