A flat coil has 200 turns and a cross-sectional area of 1.20 × 10–4 m2.
The coil is placed horizontally in a uniform magnetic field. The magnetic flux density is 0.050 T.
The magnetic field is at an angle of 30.0° to the vertical.
What is the magnetic flux linkage for this coil?
3.00 × 10–6 Wb turns
5.20 × 10–6 Wb turns
6.00 × 10–4 Wb turns
1.04 × 10–3 Wb turns
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Faraday’s law of electromagnetic induction is written below with two terms missing.
The ...................................... induced in a circuit is directly proportional to the rate of change of magnetic flux ...................................... .
What are the two missing terms?
current, density
current, linkage
electromotive force, density
electromotive force, linkage
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A coil with 500 turns is placed in a uniform magnetic field.
The average cross-sectional area of the coil is 3.0 × 10-4 m2.
The magnetic flux through the plane of the coil is reduced from 1.8 × 10-4 Wb to zero in a time t.
The average electromotive force (e.m.f.) induced across the ends of the coil is 0.75 V.
What is the value of t?
3.6 × 10–5 s
2.4 × 10–4 s
0.12s
8.3s
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The number of turns on the coils of four ideal iron-cored transformers A, B, C and D are shown in the table below.
| Transformer | Number of turns on the secondary coil | Number of turns on the primary coil |
| A | 100 | 100 |
| B | 50 | 200 |
| C | 200 | 50 |
| D | 500 | 100 |
Each transformer is connected in turn to an alternating 240 V supply.
Which transformer will give the largest output current?
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