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प्रश्न
An electric bell has an electromagnet.
पर्याय
True
False
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उत्तर
This statement is True.
Explanation:
An electric bell has a piece of iron wound by a coil. When current passes through this coil, it behaves as an electromagnet.
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संबंधित प्रश्न
When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right.
If S is kept closed, will the pointer:
(a) return to zero?
(b) stay over on the right?
(c) move to the left and stay there
(d) move to and fro until S is opened
A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the N-pole is removed?
Draw a neat labelled diagram to show the magnetic effect of electric current.
Identify the given figure, write the labels of it.
A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid ____________.
How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.
Edison used a ______ wire coil is a vacuum glass and discovered the first electric bulb in 1879.
A rectangular loop ABCD carrying a current I is situated near a straight conductor XY, such that the conductor is parallel to the side AB of the loop and is in the plane of the loop. If a steady current I is established in the conductor as shown, the conductor XY will ______.
Make four electromagnets with 20, 40, 60 and 80 turns. Connect them one by one to a battery of 2 cells. Bring the electromagnet near a box of pins. Count the number of pins attracted by it. Compare the strengths of the electromagnets.
