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AB and CD are long staright conductors, ...

`AB` and `CD` are long staright conductors, distance `d` apart, carrying a current `I`. The magnetic field on `BC` due to the currents in `AB` and `CD`

A

zero at all points

B

zero only at its midpoint

C

maximum at its midpoint

D

none of these

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The correct Answer is:
B
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