STANDARDPhysics-Magnetism
STANDARD Physics Magnetic Field due to Current MCQ Question
Type: MCQ-conceptual-Medium
A long straight wire in the horizontal plane carries a current of 75 A in north to south direction, magnitude and direction of field B at a point 3 m east of the wire is
A
4 × 10⁻⁶ T, vertical up
B
5 × 10⁻⁶ T, vertical down
C
5 × 10⁻⁶ T, vertical up
D
4 × 10⁻⁶ T, vertical down
Correct Answer
Option C
Detailed Explanation
Using Ampere's circuital law, B = (μ₀I)/(2πR). Substituting the given values, B = 5 × 10⁻⁶ T. The direction is determined by the right-hand rule, resulting in a vertical upward direction.
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