A charge of 1 coul. is placed at one end of a non-conducting rod of length \( 0.6 \mathrm{~m} \)...

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A charge of 1 coul. is placed at one end of a non-conducting rod of length \( 0.6 \mathrm{~m} \). the rod is rotated in a vertical plane about a horizontal axis passing through the other end of the rod with angular frequency \( 10^{4} \pi \) radian/sec. Find the magnetic field at a point on the axis of rotation at a distance of \( 0.8 \) from the centre of the path. Now half of the charge is removed from one end and placed on the other end. The rod is rotated in a vertical plane about horizontal axis passing through the mid-point of the rod with the same angular frequency. Calculate the magnetic field at a point on the axis at a distance of \( 0.4 \mathrm{~m} \) form the centre of the rod.
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