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प्रश्न
- Describe briefly one way producing an induced e.m.f?
- State one factor that determines the magnitude of induced e.m.f. in part (a) above.
- What factor determines the direction of induced e.m.f. in part (a) above?
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उत्तर
- A DYNAMO, which is a coil that moves constantly in a magnetic field, can generate an induced current.
- Magnitude of induced e.m.f depend upon:
- The change in the magnetic flux.
- The time in which the magnetic flux changes.
- The direction of induced e.m.f depends on Fleming's right hand rule and Lenz's law.
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संबंधित प्रश्न
- How would you demonstrate that a momentary current can be obtained by the suitable use of a magnet, a coil of wire and a galvanometer?
- What is the source of energy associated with the current obtained in part (a)?
A conductor is moved in a varying magnetic field. Name the law which determines the direction of current induced in the conductor.
The direction of induced current is obtained by ______.
The diagram in shows a coil of several turns of copper wire near a magnet NS. The coil is moved in the direction of arrow shown in the diagram.
- In what direction does the induced current flow in the coil?
- Name the law used to arrive at the conclusion in part (i).
- How would the current in coil be altered if
- the coil has twice the number of turns,
- the coil was made to move three times fast?
Explain the principle, construction and working of a dc motor.
A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference.
The direction of the magnetic field around a straight conductor carrying current can be determined by ______.
State two factors on which the magnitude of induced e.m.f. in a coil depend.
The magnetic flux through a coil perpendicular to its plane is varying according to the relation Φ = (5t3 + 4t2 + 2t − 5) Weber. If the resistant of the coil is 5 ohm, then the induced current through the coil at t = 2 sec will be ______.
