10. A long solenoid of 20 …
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10. A long solenoid of 20 turns per cm has a small loop of area 4 cm2 placed inside the
solenoid normal to its axis. If the current by the solenoid changes steadily from 4 A to
6A in 0.25, what is the (average) induced emf in the loop while the current is
changing?
Posted by Vijendra Arya 6 years, 3 months ago
- 1 answers
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Sia ? 6 years, 3 months ago
The induced emf,
{tex}\varepsilon = - \frac{{d\phi }}{{dt}}{/tex}
{tex}\varepsilon = \frac{d}{{dt}}(BA\cos \phi )(\because \cos \phi = 1){/tex}
{tex} = \frac{{20 \times 100 \times 4 \times {{10}^{ - 4}}}}{{0.2}}{/tex} = 4 volt.
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