WBJEE 2021 Physics and Chemistry Solved Paper

PHYSICS

CATEGORY - I (Q1 to Q30)

Carry 1 mark each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ¼ mark will be deducted.

Question : 24 of 80

Marks: +1, -0

A thin charged rod is bent into the shape of a small circle of radius R the charge per unit length of the rod being λ. The circle is rotated about its axis with a time period T and it is found that the magnetic field at a distance ' d ' away (d>>R)from the center and on the axis, varies as

. The values of m and n respectively are

m=2,n=2
m=2,n=3
m=3,n=2
m=3,n=3

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