Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Hard-Class 12
A long solenoid S1 with n1 turns per unit length is coupled with a smaller solenoid S2 with n2 turns per unit length. If the radii of S1 and S2 are r1 and r2 respectively, and the mutual inductance between them is given by M12 = μ0 n1 n2 π r2^2 l, what assumption is necessary for this formula to be valid?
A
The length of S1 is much greater than its radius.
B
The length of S1 is equal to the radius of S2.
C
The magnetic field is non-uniform over the area of S2.
D
The radius of S2 is much greater than the radius of S1.
Correct Answer
Option A
Detailed Explanation
The formula assumes that the solenoid S1 is long, meaning its length is much greater than its radius, ensuring a uniform magnetic field inside S1 as per the NCERT context.
Found an issue with this question?