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प्रश्न
What energy conversion takes place during the working of a d c motor?
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उत्तर
Electrical energy to mechanical energy.
संबंधित प्रश्न
State two factors on which the strength of induced e. m.f. depends.
How does a magnetic field set up by a solenoid change when number of turns are increased?
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
State two advantages of an electromagnet over a bar magnet.
State the principle of a D. C. motor.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
State the factors, on which depends the magnitude of the force acting on current carrying conductor, when it is kept in a magnetic field perpendicular to it.
A current-carrying solenoid is suspended so as to freely rotate in a horizontal plane. State in what direction will it rest. Give a reason for your answer.
or
When a solenoid that is carrying current is freely suspended, it comes to rest in a particular direction. Why does this happen?
Point out three differences between an electromagnet and a bar (or permanent) magnet.
(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.
