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Byju's Answer

Standard XII

Physics

Potential Energy of a Dipole in Uniform Electric Field

An electric d...

Question

An electric dipole of moment $\to p$ is placed normal to the lines of force of electric intensity $\to E$ , then the work done in rotating it through an angle of $180^{\circ}$ is

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+2pE

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-2pE

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Zero

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Solution

The correct option is D Zero

Work done= $\int_{90}^{270} - p E s i n θ d θ = {[p E c o s θ]}_{90}^{270} = 0$

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An electric dipole if moment p is placed normal to the lines of force of electric intensity E ,then the work done in rotating it through an angle of 180,is? In this question,which initial angle should be taken ? I am facing problem in application type question ,where I am in dilemma to take which as initial angle

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An electric dipole of moment →p is placed normal to the lines of force of electric intensity →E, then the work done in rotating it through an angle of 180∘ is

The correct option is D Zero Work done=∫27090−pE sinθdθ=[pE cosθ]27090=0

An electric dipole of moment $\to p$ is placed normal to the lines of force of electric intensity $\to E$ , then the work done in rotating it through an angle of $180^{\circ}$ is

The correct option is D Zero

Work done= $\int_{90}^{270} - p E s i n θ d θ = {[p E c o s θ]}_{90}^{270} = 0$