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Question: The electric field that can balance an electron of mass \(3.2 \times 10^{- 27}kg\)is....

The electric field that can balance an electron of mass 3.2×10−27kg3.2 \times 10^{- 27}kgis.

A

19.6×10−8NC−119.6 \times 10^{- 8}NC^{- 1}

B

20×10−6NC−120 \times 10^{- 6}NC^{- 1}

C

19.6×108NC−119.6 \times 10^{8}NC^{- 1}

D

20×106NC−120 \times 10^{6}NC^{- 1}

Answer

19.6×108NC−119.6 \times 10^{8}NC^{- 1}

Explanation

Solution

The spacing between electric lines of force increases from left to right. Therefore, E on left is greater than E on right. Force on +q+ q charge of dipole is smaller and to the right. Force on −q- qcharge of dipole is bigger and to the left. Hence the dipole will experience a force towards the left.