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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
Write some of the important uses of electromagnets.
In which of the following case does the electromagnetic induction occur?
A loop of wire is held near a magnet.
Name and state the law which determines the direction of induced current.
or
State Fleming’s right-hand rule.
Consider the energy density in a solenoid at its centre and that near its ends. Which of the two is greater?
Calculate the dimensions of (a) \[\int \overrightarrow{E} . d \overrightarrow{l,}\] (b) vBl and (c) \[\frac{d \Phi_B}{dt}.\] The symbols have their usual meaning.
What is an electromagnet?
Establish the fact that the relative motion between the coil and the magnet induces an emf in the coil of a closed circuit.
An induced current of 2.5 mA flows through a single conductor of resistance 100 Ω. Find out the rate at which the magnetic flux is cut by the conductor.
We can induce the current in a coil by ____________.
Which type of force is experienced by a moving charge in a magnetic field?
