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Two identical coils each of radius R and...

Two identical coils each of radius R and each carrying a current I in the same direction are placed along a common axis and separated by distance R. At the midpoint between the two coils the

A

magnetic field is zero

B

magnetic field is 0.8 sqrt(0.8)mu""_0I/R`

C

second derivative of magnetic field

D

first derivative of magnetic field `dB//dx =0`

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The correct Answer is:
B
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