1.

Compute the intensity of magnetisation of the bar magnet whose mass, magnetic momentand density are 200 g. 2 A m^(2) and 8 g cm^(-3),respectively.

Answer»

Solution :Density of the magnet is
Density = `("Mass")/("Volume") rArr "Volume" = ("Mass")/("Density")`
Volume = `(200 XX 10^(-3) kg)/((8 xx 10^(-3) kg) xx 10^(6) m^(-3)) = 25 xx 10^(-6) m^(3)`Magnitude of magnetic moment `p_(m) = 2 Am^(2)`
Intensity of magnetization.
I = `("Magnetic moment")/("Volume") = (2)/(25 xx 10^(-6))`
M = 0.8`xx 10^(5) Am^(-1)`


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