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[" 4.Let "r" be the distance of a point ...

[" 4.Let "r" be the distance of a point on the axis of a bar "],[" magnet from its centre.The magnetic field at such a "],[" point is proportional to "],[[" (a) "(1)/(r)," (b) "(1)/(r^(2))," (c) "(1)/(r^(3))," (d) none of these "]]

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