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Faraday's Law
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Faraday's Law
Recommended for Class 10
Faraday's Law
Faraday's law of electromagnetic induction states that the magnitude of induced e.m.f. is proportional to the rate of change of magnetic flux linkage.
Mathematically:
**|ε| = N |ΔΦ/Δt|**
or in differential form:
**ε = -N dΦ/dt**
The negative sign represents the direction described by Lenz's law.
Meaning
A faster flux change produces a larger induced e.m.f.
Therefore induced e.m.f. can be increased by:
moving magnet faster; using stronger field; increasing coil turns; changing flux more rapidly.
Example
If flux through a 100-turn coil changes by:
`0.02 Wb`
in:
`0.10 s`
then:
`|ε| = 100 × 0.020.10`
`= 20 V`
Faraday's Law — Advanced
Common Mistakes
Common Mistakes
- Mistake
Faraday's law depends on rate of change, not simply amount of magnetic flux.
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Practice
PQ
Q1. State Faraday's law
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Q2. explain rate
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Q3. calculate simple emf
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Q4. effect of turns
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Q5. effect of faster magnet.
Exam Practice
EQ
Q1. State Faraday law.
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Q2. Write equation.
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Q3. Explain rate-of-change idea.
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Q4. Solve numerical.
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Q5. State ways to increase induced emf.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.