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4.3 Electric circuits

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Question 36

In a cathode-ray tube, electrons are released from a heated metal filament by the process of thermionic emission. How can the number of electrons emitted per second from the filament be increased?

A

By increasing the temperature of the filament

B

By decreasing the temperature of the filament

C

By increasing the accelerating voltage between the cathode and anode

D

By applying a strong magnetic field across the tube

Markscheme

4.3 Electric circuits Questions

  1. IGCSE
  2. /Physics
  3. /4.3 Electric circuits

136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.

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