Two very long, straight, parallel wires carry steady currents I and – I respectively. The distance between the wires is d. At a certain instant of time, a point charge q is at a point equidistant from the two wires, in the plane of the wires. Its instantaneous velocity 
is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is:
A
B
C
D
0
Text Solution
Verified by ExpertsThe correct answer is:
D
Net magnetic field due to both the wires will be downward as shown above. Since angle between 
and 
is 180º
Therefore, magnetic force
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