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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

is zero at all points

B

is zero only at its midpoint

C

has different magnitudes at different points

D

is maximum at its midpoint

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The correct Answer is:
C
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