Physics-Magnetic Force on Current
NEET Physics Magnetic Force on Current MCQ Question
Type: MCQ-numerical-Hard-Class 12
A straight wire of mass 250 g and length 2 m carries a current of 3 A. If it is suspended in mid-air by a uniform horizontal magnetic field, what is the magnitude of the magnetic field required to achieve this suspension?
A
0.41 T
B
0.61 T
C
0.51 T
D
0.31 T
Correct Answer
Option C
Detailed Explanation
Using the balance of forces equation mg = IlB, where m = 0.25 kg, g = 9.8 m/s², I = 3 A, and l = 2 m, we find B = (mg)/(Il) = (0.259.8)/(3*2) = 0.51 T.
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