CUET · PHYSICS · PYQ PAPER 2025
In a plane electromagnetic wave, the electric field varies as \( E = 90 \sin(500x + 20 \times 10^{10}t) \text{ V/m} \). The expression for the magnetic field variation is :
- A \( 27 \times 10^{-7} \sin(500x + 20 \times 10^{10}t) \text{ T} \)
- B \( 3.3 \times 10^6 \sin(500x + 20 \times 10^{10}t) \text{ T} \)
- C \( 27 \times 10^8 \sin(500x + 20 \times 10^{10}t) \text{ T} \)
- D \( 3 \times 10^{-7} \sin(500x + 20 \times 10^{10}t) \text{ T} \)
Answer & Solution
Correct Answer
(D) \( 3 \times 10^{-7} \sin(500x + 20 \times 10^{10}t) \text{ T} \)
Step-by-step Solution
Detailed explanation
\( B_0 = \frac{E_0}{c} = \frac{90}{3 \times 10^8} = 3 \times 10^{-7} \text{ T} \) \( B = 3 \times 10^{-7} \sin(500x + 20 \times 10^{10}t) \text{ T} \)
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