Advertisements
Advertisements
प्रश्न
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
पर्याय
Single-touch
Double-touch
Using electric current
None of these
Advertisements
उत्तर
Using electric current
APPEARS IN
संबंधित प्रश्न

The diagram shows a coil wound around a U-shaped soft iron bar AB.
- What is the polarity induced at the ends A and B when the switch is pressed?
- Suggest one way to strengthen the magnetic field in the electromagnet.
- What will be the polarities at A and B if the direction of current is reversed in the circuit?
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
State two factors on which the strength of induced e. m.f. depends.
How does a magnetic field set up by a solenoid change when number of turns are increased?
Why is soft iron generally used as the core of the electromagnet?
State the condition when an electric charge can give rise to a magnetic field.
What will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
State the principle of a D. C. motor.
State the function of a split ring in D.C. motor.
Write the answer in your words.
How is an electromagnet made?
