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प्रश्न
State two factors on which the strength of induced e. m.f. depends.
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उत्तर
(i) The time of change of magnetic flux, (ii) The strength of magnetic field.
संबंधित प्रश्न
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
What is an electric motor?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
A straight current-carrying conductor is kept in a magnetic field. It Experiences a force. State three factors on which the magnitude of force Experienced by the conductor depends. Under what condition will the conductor Experience no force?
State two advantages of an electromagnet over a bar magnet.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
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or
When a solenoid that is carrying current is freely suspended, it comes to rest in a particular direction. Why does this happen?
State and explain Maxwell’s Cork Screw Rule.
(i) A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. Copy the diagram and show the setting of iron filings when a current is passed through the wire in the upward direction and the cardboard is tapped gently. Draw arrows to represent the direction of the magnetic field lines.
(ii) Name the law which helped you to find the direction of the magnetic field lines.
