NEET Physics: Electromagnetic Waves — Practice Set 19

Q1. What is the significance of the equation \( \oint \mathbf{E} \cdot \mathrm{d} \mathbf{l} = -\frac{d \Phi_B}{dt} \) in Maxwell's equations?

A. It describes the induction of an electric field by changing magnetic flux
B. It describes the induction of a magnetic field by changing electric flux
C. It states that magnetic monopoles exist
D. It relates electric flux to charge

Q2. What is the typical wavelength range of radio waves according to the document?

A. \( 1 \, \text{mm} \) to \( 700 \, \text{nm} \)
B. \( > 0.1 \, \text{m} \)
C. \( 400 \, \text{nm} \) to \( 0.6 \, \text{nm} \)
D. \( 10^{-10} \, \text{m} \) to \( 10^{-14} \, \text{m} \)

Q3. What is the wavelength range of ultraviolet rays as per the electromagnetic spectrum?

A. \( 1 \, \text{mm} \) to \( 700 \, \text{nm} \)
B. \( 400 \, \text{nm} \) to \( 0.6 \, \text{nm} \)
C. \( 10 \, \text{nm} \) to \( 10^{-4} \, \text{nm} \)
D. \( 700 \, \text{nm} \) to \( 400 \, \text{nm} \)

Q4. What is the primary source of a magnetic field as per Maxwell's generalization?

A. Only conduction current
B. Only stationary charges
C. Both conduction current and time-varying electric field
D. Only magnetic monopoles

Q5. A parallel plate capacitor with plate area \( A = 0.02 \, \text{m}^2 \) and separation \( d = 5 \, \text{mm} \) is connected to a circuit with a current of \( 2 \, \text{A} \). What is the rate of change of electric flux between the plates? (Given \( \varepsilon_0 = 8.85 \times 10^{-12} \, \text{F/m} \))

A. \( 2.26 \times 10^{11} \, \text{Vm/s} \)
B. \( 1.13 \times 10^{11} \, \text{Vm/s} \)
C. \( 4.52 \times 10^{11} \, \text{Vm/s} \)
D. \( 5.65 \times 10^{11} \, \text{Vm/s} \)

Q6. The ozone layer protects the Earth by absorbing which type of electromagnetic waves?

A. Infrared waves
B. Visible light
C. Ultraviolet rays
D. Radio waves

Q7. What type of charges produce electromagnetic waves as per the document?

A. Accelerated charges
B. Stationary charges
C. Charges moving with uniform velocity
D. Charges at rest in a magnetic field

Q8. An electromagnetic wave in vacuum has an electric field amplitude of \( 90 \, \text{V/m} \). What is the magnetic field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

A. \( 1.5 \times 10^{-7} \, \text{T} \)
B. \( 2 \times 10^{-7} \, \text{T} \)
C. \( 2.5 \times 10^{-7} \, \text{T} \)
D. \( 3 \times 10^{-7} \, \text{T} \)

Q9. What type of charges produce electromagnetic waves according to the document?

A. Accelerated charges
B. Stationary charges
C. Uniformly moving charges
D. Charges at rest

Q10. Why are visible light waves critical for human vision?

A. High energy
B. Thermal effects
C. Long wavelength
D. Detectable wavelengths

Physics — Electromagnetic Waves

Set 19 of 24

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What is the significance of the equation \( \oint \mathbf{E} \cdot \mathrm{d} \mathbf{l} = -\frac{d \Phi_B}{dt} \) in Maxwell's equations?

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