Physics
Grade-10
Easy
Question
When a magnet is placed into a coil, an induced emf is generated. The induced emf's strength is unaffected by:
- The resistivity of the wire of the coil
- The strength of the magnet
- Number of turns in the coil
- Speed with which the magnet is moved
Hint:
When a current flow is induced by emf, the resistivity of the wire doesn't affect it.
The correct answer is: The resistivity of the wire of the coil
When a magnet is placed into a coil, an induced emf is generated. The induced emf's strength is unaffected by the resistivity of the wire of the coil.
- The coil of a wire in a circuit has resistivity over the current supplied.
- When a magnet is placed into a coil, an emf is created, and induced current forms.
- Emf=
= 
Where "n" represents the number of turns in the coil
-
Hence, emf is dependent on the number of turns of the coil, the strength of the magnet and the speed with which the magnet is moved.
-
emf is independent of the resistivity of the wire of the coil.
- Thus, the resistivity of the wire will not affect the induced current.
= Where "n" represents the number of turns in the coilHence, emf is dependent on the number of turns of the coil, the strength of the magnet and the speed with which the magnet is moved.
emf is independent of the resistivity of the wire of the coil.
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