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प्रश्न
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.
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उत्तर
(i) North pole.
(ii) The electromagnet is a very strong magnet as compared to a permanent magnet.
संबंधित प्रश्न
Explain different ways to induce current in a coil.
Explain why, an electromagnet is called a temporary magnet.
Explain why, the core of an electromagnet should be of soft iron and not of steel.
What condition is necessary for the production of current by electromagnetic induction?
Which of the following scientist invented the rule of electromagnetic induction?
Write the two names in the following diagram.
Right hand thumb rule.
Write the two names in the following diagram.
Fleming’s right hand rule.
A layer of atmosphere that reflects medium frequency radio waves which is ineffective during night, is ______.
We can induce the current in a coil by ____________.
One solenoid is centered inside another. The outer one has a length of 50.0 cm and contains 6750 coils, while the coaxial inner solenoid is 3.0 cm long and π cm2 in area and contains 150 coils. The current in the outer solenoid is changing at 3000 A/s. The emf induced in the inner solenoid is ______ V.
(Round off to two decimal places.)
