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प्रश्न
The phenomenon of electromagnetic induction is
विकल्प
the process of charging a body
the process of generating magnetic field due to a current passing through a coil
producing induced current in a coil due to relative motion between a magnet and the coil
the process of rotating a coil of an electric motor
उत्तर
producing induced current in a coil due to relative motion between a magnet and the coil
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संबंधित प्रश्न
When an electric current is passed through any wire, a magnetic field is produced around it. Then why an electric iron connecting cable does not attract nearby iron objects when electric current switched on through it?
State the factors on which the strength of an electromagnet depends. How does it depend on these factors?
The direction of current in the coil at one end of an electromagnet is clockwise. This end of the electromagnet will be:
(a) north pole
(b) east pole
(c) south pole
(d) west pole
An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
(a) the speed with which the magnet is moved
(b) the number of turns of the coil
(c) the resistivity of the wire of the coil
(d) the strength of the magnet
The coil of a moving-coil galvanometer keeps on oscillating for a long time if it is deflected and released. If the ends of the coil are connected together, the oscillation stops at once. Explain.
Why soft iron is preferred to be used as the core of the electromagnet of an electric bell?
Using Lenz’s law, predict the direction of induced current in conducting rings 1 and 2 when the current in the wire is steadily decreasing.
A cylindrical bar magnet (A) and similar unmagnetized cylindrical iron bar (B) are dropped through metallic pipe. The time taken to come down by ____________.
The instrument that use to defect electric current in the circuit is known as ____________.
For making a strong electromagnet the material of the core should be ______.
