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A uniformly charged sphere of radius R=2...

A uniformly charged sphere of radius `R=2m` and volume charge density `rho` has a spherical cavity as shown.A point object of mass `m=1g` and charge `q=2times10^(-4)C` is thrown from point A.The minimum velocity required at A for it to reach point B in meter per second is `(rho=3 varepsilon_(0)times10^(-3)cm^(-3)) `

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