1.

A proton is to circulate the earth along the equator with a speed of `1*0xx10^7ms^-1`. Find the minimum magnetic field which should be created at the equator for this purpose. The mass of proton `=1*7xx10^(-27)kg` and radius of earth `=6*37xx10^6m`.

Answer» Correct Answer - `1*67xx10^-8T`
`qv B=mv^2//r`
or `B=(mv)/(qr)=(1*7xx10^(-27)xx(1*0xx10^7))/((1*6xx10^(-19))xx(6*37xx10^6))`
`=1*67xx10^-8T`


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