A particle of negative charge of magnitude ' \( q \) ' is revolving...

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A particle of negative charge of magnitude ' \( q \) ' is revolving with constant speed ' \( \mathrm{V} \) ' in a circle of radius ' \( \mathrm{R} \) ' as shown in figure. Find the magnetic field (magnitude and direction) at the following points :
(i) centre of the circle (magnitude and direction)
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