NEET Electromagnetic Waves — Set 16

Question 1

What does the Ampere-Maxwell law relate in Maxwell's equations?

Accepted Answer

The Ampere-Maxwell law relates the magnetic field to both the conduction current and the displacement current, given by $ \oint \mathbf{B} \cdot \mathrm{d} \mathbf{l} = \mu_0 i_c + \mu_0 \varepsilon_0 \frac{d \Phi_E}{dt} $.

Question 2

What is a common method to detect gamma rays as per the document?

Accepted Answer

The document lists photographic film, Geiger tubes, and ionization chambers as detectors for gamma rays. Geiger tubes are a common choice.

Question 3

Why does the absence of magnetic monopoles imply a specific property about magnetic field lines?

Accepted Answer

The absence of magnetic monopoles, as stated by Gauss’s law for magnetism, implies that magnetic field lines are always closed loops, with no isolated sources or sinks.

NEET Physics: Electromagnetic Waves — Practice Set 16

Q1. What does the Ampere-Maxwell law relate in Maxwell's equations?

Q2. What is a common method to detect gamma rays as per the document?

Q3. Why does the absence of magnetic monopoles imply a specific property about magnetic field lines?

Q4. What role does the displacement current play in a region where there is no conduction current?

Q5. Why are gamma rays used in medical applications to treat cancer?

Q6. What is one technological importance of electromagnetic waves mentioned in the document?

Q7. In electromagnetic theory, what fundamental principle allows electromagnetic waves to sustain their propagation in vacuum without energy loss?

Q8. What is the primary source of infrared waves mentioned in the document?

Q9. Why does the depletion of the ozone layer pose a significant health risk?

Q10. An electromagnetic wave in vacuum has a wavelength of \( 15 \, \text{m} \). What is its frequency? (Given \( c = 3 \times 10^8 \, \text{m/s} \))