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प्रश्न
An electromagnet does not attract a piece of iron.
पर्याय
True
False
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उत्तर
This statement is False.
Explanation:
- The working of an electromagnet is based on the magnetic effect of electric current.
- When current passes through it, an electromagnet behaves as a magnet, attracting a piece of iron.
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संबंधित प्रश्न
Name the scientist who discovered the magnetic effect of current.
The magnetic effect of current was discovered by:
(a) Maxwell
(b) Fleming
(c) Oersted
(d) Faraday
What device reverses the current?
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In the arrangement shown in Figure there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then
Unscramble the following words:
HTRCO
Edison used a ______ wire coil is a vacuum glass and discovered the first electric bulb in 1879.
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As shown in the diagram an aluminium rod 'AB' is suspended horizontally between the two poles of a strong horse shoe magnet in such a way that the axis of rod is horizontal and the direction of the magnetic field is vertically upward. The rod is connected in series with a battery and a key.
State giving reason:
- What is observed when a current is passed through the aluminium rod from end B to end A?
- What change is observed in a situation in which the axis of the rod 'AB' is moved and aligned parallel to the magnetic field and current is passed in the rod in the same direction?
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.
