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प्रश्न
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
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उत्तर
On reserving the direction of current in a wire, the magnetic field produced by it gets reversed.
संबंधित प्रश्न
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
principle of an electric motor ?
Name the type of transformer shown in fig . What changes will you observe regarding the brightness of the lamp, if
(a) The no. of turns in the secondary is doubled?
(b) The part X of the transformer is removed?
( c) The core of the transformer is made out of copper?
(d ) The A.C. supply is replaced by D.C.?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
State the two properties of the magnetic lines of force around a circular coil.
What will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
What energy conversion takes place during the working of a d c motor?
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
(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.
Write the answer in your words.
How is an electromagnet made?
