Q.

The electric field intensity which would be just sufficient to balance the weight of a particle of charge 10 μC and mass 10 mg is (take g=10m/s2)

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a

10 N/C, in upward direction  

b

103N/C , in downward direction

c

104N/C, in upward direction

d

10 N/C, in downward direction

answer is C.

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Detailed Solution

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E=105×10105NC1=10NC1 downward

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