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[" 18.A proton takes "10^(-12)" s to com...

[" 18.A proton takes "10^(-12)" s to complete one "],[" revolution in uniform magnetic field.The time "],[" taken in another orbit of double the radius in "],[" the same field is "],[[" 1) "0.5times10^(-12)" sec "," 2) "2times10^(-12)sec],[" 3) "4times10^(-12)sec," 4) "10^(-12)sec]]

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