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An electron starts from rest and travels...

An electron starts from rest and travels `0.9`m in an electric field of `200`V//m. After this , it enters a magnetic field at right angle to its direction of motion . If the radius of circular path of the electron is `9`cm, the magnetic field induction is (Given e=`1.6xx10^(-19)`C,
` m=9xx10^(-31)`g) `

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