CUET · PHYSICS · PYQ PAPER 2025
Two identical short magnetic dipoles of magnetic moment \( 2 \text{ Am}^2 \) are placed with their axis mutually perpendicular and centers 2 m apart. The magnitude of the resultant magnetic field at the midpoint (O) between the dipoles is :
- A \( 2\sqrt{5} \times 10^{-7} \text{ T} \)
- B \( 4\sqrt{5} \times 10^{-7} \text{ T} \)
- C \( 2\sqrt{5} \times 10^{-6} \text{ T} \)
- D \( 4\sqrt{5} \times 10^{-6} \text{ T} \)
Answer & Solution
Correct Answer
(A) \( 2\sqrt{5} \times 10^{-7} \text{ T} \)
Step-by-step Solution
Detailed explanation
\( r = \frac{2 \text{ m}}{2} = 1 \text{ m} \) \( B_{axial} = \frac{\mu_0}{4\pi} \frac{2M}{r^3} = 10^{-7} \text{ T m/A} \times \frac{2 \times 2 \text{ Am}^2}{(1 \text{ m})^3} = 4 \times 10^{-7} \text{ T} \)…
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