Electrostatics Question 234

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) [MP PMT/PET 1998; DPMT 2000]

Options:

A) K2λ1λ2R2

B) K2λ1λ2R

C) Kλ1λ2R2

D) Kλ1λ2R

Show Answer

Answer:

Correct Answer: B

Solution:

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

therefore F2l=2kλ1λ2R

Also F1l=F2l=Fl=2kλ1λ2R



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