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Question

There will be no force between two current carrying wires if currents are
  1. Parallel to each other
  2. Antiparallel to each other
  3. Perpendicular to each other
  4. Nothing can be said

A
Parallel to each other
B
Perpendicular to each other
C
Nothing can be said
D
Antiparallel to each other
Solution
Verified by Toppr

The magnetic field due to a current-carrying wire circulates around the wire, in other words, the magnetic field vectors point tangent to circles whose planes are perpendicular to the wire and whose centers are intersected by the wire.

The magnetic force experienced by a moving charge q (like those in line currents) with a velocity v in a field B is given by
F=q(v×B)
Since The velocity of charge conductor and magnetic field is zero therefore vXB=VBsin(0)=0
F=q(v×B)=0

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