Q.
A charge particle, having mass m and charge –q is thrown from the center of charged ring, having linear charge density λ and radius r fixed in a stationary space, along its axis. The minimum speed v for which it will escape this isolated ring is
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a
qλ4mε0
b
qλ3mε0
c
qλ2mε0
d
qλmε0
answer is D.
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Detailed Solution
Use energy conservation , 12mv2 +(-14πε02πrλrq) =0
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