A bar magnet has a pole strength of 15 Am. If the distance from its centre of either of the poles is 15 cm, arrange the following steps in sequential order to find its magnetic moment in SI unit.
(a) Write the given value of pole strength (m) of the magnet.
(b) Substitute the value in the above formula to get the value of M.
(c) Find the value of length (l) of the magnet from the problem and convert it into SI unit.
(d) Write the required formula, i.e., magnetic moment (M)=mx 2l

Options

A. acbd
B. cabd
C. adcb
D. dbac

Answer

C

Explanation

(a) Write the given value of pole strength (m ) of the magnet.
(b) Write the required formula, ie magnetic moment (M) =m x 2l
(c) Find the value of (l) of the magnet from the problem and convert it into SI unit.
(d) Substitute the values in the above formula to get the value of M.