Electrostatics Question 657

Question: Two infinitely long parallel wires having linear charge densities λ1 and λ2 respectively are placed at a distance of R metres. The force per unit length on either wire will be (k=14πε0)

Options:

A) k2λ1λ2R2

B) k2λ1λ2R

C) kλ1λ2R2

D) kλ1λ2R

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Force on l length of the wire 2 is F2=QE1=(λ2l)2kλ1R

F2l=2kλ1λ2R Also F2l=F2l=Fl=2kλ1λ2R



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