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Question:

Find the magnetic field at point P due to a straight line segment AB of length 6cm carrying a current of 5A. (See figure) (µ₀=4π×10⁻⁷N A⁻²)

2.0×10⁻⁵T

1.5×10⁻⁵T

3.0×10⁻⁵T

2.5×10⁻⁵T

Solution:

Correct option is D.
1.5×10⁻⁵T
B=µ₀I/4πd(2sinθ)
d=4cm
sinθ=3/5