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  3. 3 a circular coil is in y z plane with centre at o

3 A circular coil is in y z plane with centre at origin The coil...

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3 A circular coil is in y z plane with centre at origin The coil is carrying a constant current Assuming direction of magnetic field at x 25 cm to be positive direction of magnetic field which of the following graphs shows variation of magnetic field along x axis BA B a c Answer 0 BA B 0 x d b HONI 2R 3 b Direction of magnetic field at every point on axis of a current carrying coil remains same though magnitude varies Hence magnetic induction for whole the x axis will remain positive Therefore c and d are wrong Slope of the graph will be Magnitude of magnetic field will vary with x according to law Ho NIR 2 R x 3 2 Hence at x 0 B BA O dB dx O and when x B 0 3 NIR x 2 R x 5 2 It means at x 0 slope is equal to zero or tangent to the graph at x 0 must be parallel to x axis Hence b is correct and a is wrong Did you find it helpful

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