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Edexcel | Physics WPH0 | W 15 4 1 | 1 hour 30 minutes
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13
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The diagram shows a simple generator. It has a flat coil of negligible resistance which

rotated at a steady frequency in a uniform magnetic field.

 

13
(a)
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2 Mark s

Determine the frequency of rotation of the coil.

Frequency =

13
(b)
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2 Mark s

Determine the magnetic flux density of the field.

Magnetic flux density =

13
(c)
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3 Mark s

Determine the maximum e.m.f. induced in the coil.

Maximum e.m.f. =

tangent drawn at 2.5, 7.5 or 12.5 ms

Or linear section of graph used ±0.5 vertical scale

Value(s) substituted into ε = Δ(NΦ)/Δt

ε = (±)12.5 V – 14.0 V

[common error is to find average value over half a cycle →8 V scores MP2

only]

Or

Use of ε = BNAω (ecf B from(b) and f from (a))

Use of ω = 2πf

ε = 12.6 V

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