Question

Two magnets, each of magnetic moment ‘M’ are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be

• A. 2 M
• B. $\sqrt { 2 } M$
• C. 0.5 M
• D. M

Answer 1

Answer: (B)

$\sqrt { 2 } M$

Answer 2

$\Rightarrow M _ { \text {net } } = \sqrt { M ^ { 2 } + M ^ { 2 } } = \sqrt { 2 } M$