CUET · PHYSICS · PYQ PAPER 2023
Two similar magnetic poles having pole strengths in the ratio 1 : 4 are placed 6 cm apart. The distance from a smaller pole in strength where net magnetic field is zero will be :
- A 1.5 cm
- B 4 cm
- C 3 cm
- D 2 cm
Answer & Solution
Correct Answer
(D) 2 cm
Step-by-step Solution
Detailed explanation
\(B_1 = B_2\) \(\frac{m_1}{x^2} = \frac{m_2}{(r-x)^2}\) \(\frac{1}{x^2} = \frac{4}{(6-x)^2}\) \(\frac{1}{x} = \frac{2}{6-x}\) \(6-x = 2x\) \(3x = 6\) \(x = 2 \text{ cm}\)
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