Statement 1: When radius of a circular loop carrying current is doubled, its magnetic moment becomes four times.
Statement 2: Magnetic moment depends on the area of the loop.

Options

A. If both the assertion and reason are true and reason is a true explantion of the assertion.
B. If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.
C. If the assertion is true but reason false
D. If both the assertion and reason are false.

Answer

A

Explanation

Initially moment `M=Ipir^(2)`
And afterwards `M'=Ipi(2r)^(2)`
`=4I(pir^(2))=4M`
So magnetic momentum becomes four times when radius is doubled.