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प्रश्न
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
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उत्तर
The name of the rule is clock rule and it states. “If we look at the face of the loop and the direction of the current is anticlockwise, the direction of the magnetic field is north. If the direction of the current is clockwise, the direction of the magnetic field is south.”
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संबंधित प्रश्न
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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.?
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
Answer the following in short.
Name a few common appliances that use electromagnets.
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State the purpose of the iron core.
How does a magnetic field set up by a solenoid change when a soft iron core is inserted inside solenoid?
State two advantages of an electromagnet over a bar magnet.
State the principle of a D. C. motor.
