Neco 2025 Physics Question 18

Practice objective / multiple choice question 18 from the 2025 Neco Physics examination.

Neco 2025 Physics Objective / Multiple Choice Hard Difficulty

Question 18 NECO • 2025 • PHYSICS • objective

A rectangular coil of 50 turns has dimensions 0.20 m by 0.10 m and rotates with constant angular speed \(\omega\) in a uniform magnetic field of magnitude 0.5 T, the axis of rotation being perpendicular to the field. The coil is connected to an external resistor \(R\) (its own resistance is negligible). The maximum induced emf observed is 12 V. (a) Calculate the angular speed \(\omega\). (b) Find the value of \(R\) that makes the average power dissipated in the resistor equal to 6 W.

Correct Answer A. ω = 24 rad/s; R = 12 Ω

B. ω = 24 rad\/s; R = 8 Ω

C. ω = 20 rad\/s; R = 15 Ω

D. ω = 30 rad\/s; R = 10 Ω

Correct Answer

Correct Option:

ω = 24 rad/s; R = 12 Ω

This is Neco 2025 Physics Question 18. It is one of the objective questions from the 2025 Neco Physics examination.

Difficulty level: Hard .

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