AIIMS2000Physics-Magnetism
AIIMS 2000 Physics Magnetic Field MCQ Question
Type: MCQ-numerical-Hard-Class 12
What should be the amount of current through the ring of radius 5 cms so that field in the centre is with earth’s magnetic field of 7 × 10⁻⁹ Wb/m² is
A
0.5 Å
B
0.28 Å
C
2.8 Å
D
none.
Correct Answer
Option D
Detailed Explanation
Using the formula for magnetic field at the center of a current loop, B = (μ₀I)/(2r), and equating it to the given magnetic field, the current can be calculated.
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