In the following figure magnitude of the magnetic field at the point p is (a) (μ₀ I)/(4π r) + (μ₀ I)/(r) (b) (μ₀ I)/(4π r) + (μ₀ I)/(2r) (c) (μ₀ I)/(4π r) + (μ₀ I)/(4r) (d) (μ₀ I)/(4π r) - (μ₀ I)/(4r)

Answer: (c). Section 1 lies along a line through P, so it gives zero. Semicircle 2: (μ₀ I)/(4r); section 3 is semi-infinite starting directly below P: (μ₀ I)/(4π r). Both are out of the page: B = (μ₀ I)/(4π r) + (μ₀ I)/(4r) So the answer is (c).

In the following figure magnitude of the magnetic field at the point… | MHT CET 2025 (25 Apr, Shift 2)

Q21MHT CET 2025 · 25 APR · SHIFT 2Medium

Magnetic Field of Straight Wires

In the following figure magnitude of the magnetic field at the point $p$ is

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Answer: (c)

Section 1 lies along a line through P, so it gives zero.
Semicircle 2: $\frac{\mu_0 I}{4r}$ ; section 3 is semi-infinite starting directly below P: $\frac{\mu_0 I}{4\pi r}$ .
Both are out of the page: $B = \frac{\mu_0 I}{4\pi r} + \frac{\mu_0 I}{4r}$
So the answer is (c).

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