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CUET · PHYSICS · PYQ PAPER 2023

What is the approximate earth's dipole moment, if the earth's magnetic field at the Equator is approximately 0.5 G and diameter is \( 15.0 \times 10^6 \text{ m} \)?

  1. A \( 1.05 \times 10^{8} \text{ Am}^2 \)
  2. B \( 6.5 \times 10^{30} \text{ Am}^2 \)
  3. C \( 2.1 \times 10^{23} \text{ Am}^2 \)
  4. D \( 1.05 \times 10^{23} \text{ Am}^2 \)
Verified Solution

Answer & Solution

Correct Answer

(C) \( 2.1 \times 10^{23} \text{ Am}^2 \)

Step-by-step Solution

Detailed explanation

\( B_E = 0.5 \text{ G} = 0.5 \times 10^{-4} \text{ T} \) \( r = D/2 = (15.0 \times 10^6 \text{ m})/2 = 7.5 \times 10^6 \text{ m} \)…
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