Question

A bar magnet has length 3 cm, cross-sectional area 4 cm^2, and magnetic moment 6 Am². The intensity of magnetisation of bar magnet is ______.

Options

• `2 xx 10^5  "A"//"M"`

• `3 xx 10^5  "A"//"M"`

• `4 xx 10^5  "A"//"M"`

• `5 xx 10^5  "A"//"M"`

Answer 1

A bar magnet has length 3 cm, cross-sectional area 4 cm^2, and magnetic moment 6 Am². The intensity of magnetisation of bar magnet is `underline(5 xx 10^5  "A"//"M"`. 

Explanation:

Intensity of magnetization = `"M"_"net"/"Volume"`

= `"M"_"net"/("length" xx "area of cross-section"`

= `6/(3 xx 10^-2 xx 4 xx 10^-4)`

= `5 xx 10^5  "A"//"m"`