Advertisements
Advertisements
प्रश्न
What is an electromagnet? What do you know about the simplest form of an electromagnet?
उत्तर
The electromagnet is a temporary magnet which can be magnetized or demagnetized in a very short time as per our requirements. In the simplest form, an electromagnet consists simply of a soft iron core around which a large number of turns of insulated wire are wound. Two of the simple forms of an electro magnet are shown in the figure alongside.
APPEARS IN
संबंधित प्रश्न
In which of the following case does the electromagnetic induction occur?
The current is stopped in a wire held near a loop of wire .
Welders wear special glass goggles while working. Why? Explain.
You have been provided with a solenoid AB.
(i) What is the polarity at end A?
(ii) Give one advantage of an electromagnet over a permanent magnet.
State Lenz’s law.
State Fleming’s right-hand rule.
A cylindrical bar magnet (A) and similar unmagnetized cylindrical iron bar (B) are dropped through metallic pipe. The time taken to come down by ____________.
Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.
A magnet is attached to a spring. The magnet can go in and out of the stationary coil. He lifted the Magnet and released it to make it oscillate through the coil.
Based on your understanding of the phenomenon, answer the following question.
Consider the situation where the Magnet goes in and out of the coil. State two changes which could be made to increase the deflection in the galvanometer.
Induced current flows through a coil ______.
