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QPages 351-352: Q2: HC Verma: Concepts of Physics - Volume 2 Electric Current through Gases Pages 351-352: Q2 Solution: Cathode rays are passing through a discharge tube. In the tube, …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that because cathode rays are electrons, only an electric field is present, ignoring that the current flow in the tube generates a magnetic field. Remember that any steady current in a conductor or gas discharge produces both an electric field (from potential difference) and a magnetic field (from moving charges).

Cathode rays are passing through a discharge tube. In the tube, there is _________ .

Multiple Choice Options

  • A an electric field but no magnetic field
  • B a magnetic field but no electric field
  • C an electric as well as a magnetic field
  • D neither an electric nor a magnetic field

Step-by-Step Verified Solution

**Answer:** (c) an electric as well as a magnetic field. **Step-by-Step Explanation:** In a discharge tube, there is an electric field due to the applied voltage and a magnetic field due to the current.

All Questions in this Chapter

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