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What is the average emf induced in a coil of 20 turns when the magnetic flux cutting it decreases from 2.3 Wb to 1.4 Wb in 0.4 s? - Leaving Cert Physics - Question h - 2009
Question h
What is the average emf induced in a coil of 20 turns when the magnetic flux cutting it decreases from 2.3 Wb to 1.4 Wb in 0.4 s?
Worked Solution & Example Answer:What is the average emf induced in a coil of 20 turns when the magnetic flux cutting it decreases from 2.3 Wb to 1.4 Wb in 0.4 s? - Leaving Cert Physics - Question h - 2009
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Calculate Average EMF Induced
Answer
Using Faraday's law, the average emf, ( E ), induced in the coil can be calculated with the formula:
[ E = -N \frac{\Delta \Phi}{\Delta t} ]
Where:
- ( N = 20 ) turns
- ( \Delta \Phi = -0.9 , \text{Wb} )
- ( \Delta t = 0.4 , \text{s} )
Substituting the values:
[ E = -20 \frac{-0.9}{0.4} = 45 , \text{V} ]