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2 An electron (magnitude of its change is (q) = 1.6x109 Coulombs, and mass of an election m = 9.11x103 kg) enters a magnetic

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141=1-6x109 C r G charge on electron (magnitude) V= 1.5X108 mis BO speed of electron Me= 9.11X10 31131 > mass of electron B=2Required centripetal force for electron is meve which is provided by magnetic force. So, ४ 191VB = Meu2 r » r- r= meva alr= mr=4.2703x10 3 x 10st m 7/r= 4.27038103ml >/r=4.2703 km

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