WAEC Physics 2023 Objective — Question 12
Question 12 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.
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A solenoid is constructed by winding an insulated copper on a long test tube. A constant direct current is passed through the solenoid. Which of the following actions will not increase the strength of the magnetic field of the solenoid?
- A. Inserting a nickel rod in the test tube
- B. Inserting brass rod in the test tubeCorrect
- C. Soft iron rod in the test tube
- D. Steel rod in the test tube
Explanation
Nickel, soft iron and steel are ferromagnetic materials that would increase the magnetic field strength; brass is non-ferromagnetic and would not increase the field.
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