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What is the radius of the path of an ele...

What is the radius of the path of an electron (mass 9 × 10-31 kg and charge `1.6 ×x 10^(–19)` C) moving at a speed of `3 ×x10^7 ` m/s in a magnetic field of `6 x× 10^(-4)` T perpendicular to it? What is its frequency? Calculate its energy in keV. `(1eV = 1.6 xx 10^(-19) J)`

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