ESAT (Engineering and Science Admissions Test) · Physics

Magnetism and electromagnetism

5 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 5 questions

A transformer has $1000$ turns on the primary coil and $50$ on the secondary coil. The primary is connected to a $230 V$ a.c. supply. What is the secondary voltage?
A coil with a flux linkage that falls uniformly from $0.50 Wb turns$ to zero in $0.25 s$ . What is the magnitude of the induced e.m.f.?
A straight wire of length $0.30 m$ carries $5.0 A$ at right angles to a magnetic field of $0.40 T$ . What is the force on the wire?
An electron ( $e = 1.6 \times 1 0^{- 19} C$ ) moves at $2.0 \times 1 0^{6} m/s$ at right angles to a magnetic field of $0.50 T$ . What is the force on it?
In a motor, the current in the coil is reversed but the magnetic field direction is left unchanged. What happens to the direction of the force on the coil sides?

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