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Moving Charges and Magnetism — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
Question
Same current is flowing through two identical coils. Their centers are common and their planes are mutually perpendicular. Magnetic field at the center due to one coil is B then the resultant magnetic field at the common center is :
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Answer

(c )$\sqrt{2} B$

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