A positively charged particle of mass (m) and charge (+q) moves in a circle of radius (r)

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A positively charged particle of mass \(m\) and charge \(+q\) moves in a circle of radius \(r\) in a uniform magnetic field of magnitude \(B\). How does the radius of the particle's motion change when 

(a) the magnitude of the magnetic field is reduced into half,

(b) the mass of the charge is doubled, 

(c) the sign of the charge is changed to negative?

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