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Questions and Answers
What is the main principle behind electromagnetic induction?
What is the main principle behind electromagnetic induction?
- A magnetic field induces a current in a stationary coil.
- A magnetic field always induces a current, regardless of its change.
- A constant magnetic field induces a current in a coil.
- A changing magnetic field induces a current in a coil. (correct)
In the experiment, what role does the galvanometer play?
In the experiment, what role does the galvanometer play?
- It measures the magnetic field strength.
- It changes the direction of the magnetic field.
- It measures the induced current in the coil. (correct)
- It generates the magnetic field.
Why does moving the north pole of the magnet into the coil induce a current?
Why does moving the north pole of the magnet into the coil induce a current?
- The coil generates a resisting magnetic field.
- The magnetic field strengthens inside the coil.
- The relative motion causes a change in the magnetic field. (correct)
- The north pole always generates current.
What would happen if you repeat the experiment with a coil having more turns?
What would happen if you repeat the experiment with a coil having more turns?
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What is the effect of using the south pole of the magnet instead of the north pole for the induction experiment?
What is the effect of using the south pole of the magnet instead of the north pole for the induction experiment?
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Why is it essential for the magnetic field to change with time in electromagnetic induction?
Why is it essential for the magnetic field to change with time in electromagnetic induction?
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Study Notes
Electromagnetic Induction
- The phenomenon of electromagnetic induction occurs when a circuit, such as a coil, is placed in a region where the magnetic field is changing with time.
Conditions for Electromagnetic Induction
- A changing magnetic field can induce a current in a circuit.
- The magnetic field can change due to relative motion between a coil and a magnet placed near the coil.
- A current-carrying conductor also produces a magnetic field that changes with a change in the current flowing through it.
Experiment to Demonstrate Electromagnetic Induction
- The experiment requires a magnetic bar, a galvanometer, a coil, and connecting wires.
- Connect the coil to a galvanometer and observe the changes in the galvanometer needle when:
- The north pole of a strong bar magnet is moved into the coil.
- The south pole of the bar magnet is moved into the coil.
- Repeat the procedure with coils having different numbers of turns to observe the variation in the deflection of the galvanometer needle.
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Test your understanding of electromagnetic induction, a fundamental concept in physics where a changing magnetic field induces an electric current.
