In figure there are two concentric coils in perpendicular planes ca...

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In figure there are two concentric coils in perpendicular planes carrying equal currents. Magnetic field at centre is B. If current in one coil becomes zero, then magnitude of new magnetic field will be
(1) \( \frac{B}{2} \)
(2) \( \frac{B}{3} \)
(3) \( \frac{B}{\sqrt{2}} \)
(4) \( B \sqrt{2} \)
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