Physics-Magnetic Properties of Materials
NEET Physics Magnetic Properties of Materials MCQ Question
Type: MCQ-numerical-Easy-Class 12
A solenoid has a core with a relative permeability of 400, carrying a current of 2 A and 1000 turns per meter. What is the magnetisation M of the core?
A
8 x 10^5 A/m
B
2 x 10^3 A/m
C
1.2 x 10^5 A/m
D
5 x 10^4 A/m
Correct Answer
Option A
Detailed Explanation
Magnetisation M is calculated using M = (μ_r - 1)H, where H = nI = 2 x 10^3 A/m. Therefore, M = 399 x 2 x 10^3 A/m = 8 x 10^5 A/m.
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