MCQ
There will be no force between two wires carrying currents if currents are:
- AParallel to each other
- BAntiparallel to each other
- ✓Perpendicular to each other
- DNone of these.
✓
Answer
Correct option: C.
Perpendicular to each other
Force on a current carrying wire placed in a magnetic field is given by $F = I (l \times B)$ So when the wires are perpendicular the magnetic field produced by one of them will be along the length of the other and we know cross product of two vectors along the same direction is zero.
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