A small magnet of dipole moment `M` is kept on the arm of a deflection magentometer set in tan `A` position at a distance of `0.2 m`. If the deflection is `60^(@)`, find the value of `P (B_(H)=0.4xx10^(-4)T)`.A. `2.77 Am^(2)`B. `8 Am^(2)`C. `0.2 Am^(2)`D. None of these

A small magnet of dipole moment `M` is kept on the arm of a deflection

1.	A small magnet of dipole moment `M` is kept on the arm of a deflection magentometer set in tan `A` position at a distance of `0.2 m`. If the deflection is `60^(@)`, find the value of `P (B_(H)=0.4xx10^(-4)T)`.A. `2.77 Am^(2)`B. `8 Am^(2)`C. `0.2 Am^(2)`D. None of these
Answer» Correct Answer - A `because" "B=B_(H)tantheta` `"or "(mu_(0))/(4pi)(2M)/(r^(3))=0.4 xx 10^(-4)tan60^(@)` `therefore (mu_(0)M)/(2pi(0.2)^(3))=0.4 xx 10^(-4)tan60^(@)` `M=(0.4xx4pixx(0.2)^(3)xx10^(-4)xxsqrt(3))/(2xxmu_(0))` `=(0.00277xx10^(-4))/(10^(-7))` `therefore " "M=2.77Am^(2)`

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