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Q.

Two infinite linear charges are placed parallel to each other at a distance 0.1 m from each other. If the linear charge density on each is 5μC/m, then the force acting on a unit length of each linear charge is _______ N/m.

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a

4.2

b

4.8

c

4.6

d

4.5

answer is D.

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Detailed Solution

The field due to long linear charge at a distance ‘d’ from it =2Kλd

Charge per unit length on the other charge=λ

Force between two line charges on a unit length is 

=2kλd.λ=2×9×109×5×10-620.1=4.5 N/m

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