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A proton is to circulate the earth along...

A proton is to circulate the earth along the equator with a speed of `1.0 xx 10^(7)` m/s. The minimum magnetic field which should be created at the equator for this purpose. (The mass of proton `=1.7 xx 10^(-27)` kg and radius of earth `= 6.37 xx 10^(6)` m.) will be (in `"Wb/m"^(2)`)

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