A long solenoid has `200 turns per cm` and carries a current `i`. The magnetic field at its centre is `6.28xx10^(-2) weber//cm^(2)`. Another long soloenoid has `100 turns per cm` and it carries a current `(i)/(3)`. The value of the magnetic field at its centre isA. `1.05 xx 10^(-2) Weber//m^(2)`B. `1.05 xx 10^(-5) Weber//m^(2)`C. `1.05 xx 10^(-3) Weber//m^(2)`D. `1.05 xx 10^(-4) Weber//m^(2)`

A long solenoid has `200 turns per cm` and carries a current `i`. The

1.	A long solenoid has `200 turns per cm` and carries a current `i`. The magnetic field at its centre is `6.28xx10^(-2) weber//cm^(2)`. Another long soloenoid has `100 turns per cm` and it carries a current `(i)/(3)`. The value of the magnetic field at its centre isA. `1.05 xx 10^(-2) Weber//m^(2)`B. `1.05 xx 10^(-5) Weber//m^(2)`C. `1.05 xx 10^(-3) Weber//m^(2)`D. `1.05 xx 10^(-4) Weber//m^(2)`
Answer» Correct Answer - A `(B_(2))/(B_(1)) = (mu_(0)n_(2)i_(2))/(mu_(0)n_(i)i_(1)) rArr (B_(2))/( 6.28 xx10^(-2)) = ( 100xx(i)/(3))/(200xxi)` rArr = (6.28xx10^(-2))/(6) = 1.05 xx10^(-2) Wb//m^(2)`

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