Two opposite and equal charges $$4$$×$$10$$−$$8$$ coulomb when placed $$2$$×$$10$$−$$2$$ cm away from a dipole. If this dipole is placed in an external electric field $$4$$×$$108$$ newton $$/$$ coulomb the value of maximum torque and the work done in rotating it through $$1800$$ will be

Question

Two opposite and equal charges $$4$$×$$10$$−$$8$$  coulomb when placed $$2$$×$$10$$−$$2$$ cm away from a dipole. If this dipole is placed in an external electric field $$4$$×$$108$$  newton $$/$$ coulomb the value of maximum torque and the work done in rotating it through $$1800$$  will be

Infinity Learn · Accepted Answer

Dipole moment $$p=qd$$ $$=$$ $$4$$×$$10$$−$$8$$ ×$$2$$×$$10$$−$$4=8$$×$$10$$−$$12$$ CmMaximum $$torque=pEsin$$θ$$=pEsin90=8$$×$$10$$−$$12$$×$$4$$×$$108=32$$×$$10$$−$$4$$ NmWork done in rotating $$through1800=pE($$$$cos$$θ$$1-$$$$cos$$θ$$2)==pE(cos0-cos180)=2pE=2$$×$$32$$×$$10$$−$$4=64$$×$$10$$−$$4J$$

Two opposite and equal charges $4 \times 10^{- 8}$ coulomb when placed $2 \times 10^{- 2}$ cm away from a dipole. If this dipole is placed in an external electric field $4 \times 10^{8}$ newton / coulomb the value of maximum torque and the work done in rotating it through $180^{0}$ will be

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Two opposite and equal charges 4×10−8 coulomb when placed 2×10−2 cm away from a dipole. If this dipole is placed in an external electric field 4×108 newton / coulomb the value of maximum torque and the work done in rotating it through 1800 will be

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Ready to Test Your Skills?

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Two opposite and equal charges $4 \times 10^{- 8}$ coulomb when placed $2 \times 10^{- 2}$ cm away from a dipole. If this dipole is placed in an external electric field $4 \times 10^{8}$ newton / coulomb the value of maximum torque and the work done in rotating it through $180^{0}$ will be