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प्रश्न
Draw a labelled diagram to make an electromagnet from a soft iron bar. Mark the polarity at its ends in your diagram. What precaution would you observe while making it?
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उत्तर
The labelled diagram is shown in figure.
Precaution: The source of current must be the D. C. battery.
संबंधित प्रश्न
Name a common device that uses electromagnets.
State whether the following statement are true or false:
A generator works on the principle of electromagnetic induction.
A conducting rod is moved with a constant velocity v in a magnetic field. A potential difference appears across the two ends _____________ .
Obtain an expression for motional emf from Lorentz force.
A 50 cm long solenoid has 400 turns per cm. The diameter of the solenoid is 0.04 m. Find the magnetic flux linked with each turn when it carries a current of 1 A.
Shown in the figure below is a metre bridge set up with null deflection in the galvanometer. The value of the unknown resistance R is ______
What can produce a current in a coil even when the coil does not move?
Which movement of a coil can produce a current?
Which type of motor works on electromagnetic induction?
