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प्रश्न
Show that Lenz’s law is in accordance with the law of conservation of energy.
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उत्तर
- The truth of Lenz’s law can be established on the basis of the law of conservation of energy.
- According to Lenz’s law, when a magnet is moved either towards or away from a coil, the induced current produced opposes its motion.
- As a result, there will always be a resisting force on the moving magnet.
- Work has to be done by some external agency to move the magnet against this resisting force.
- Here the mechanical energy of the moving magnet is converted into electrical energy which in turn, gets converted into Joule heat in the coil i.e., energy is converted from one form to another.
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संबंधित प्रश्न
The phenomenon of electromagnetic induction is
A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region of uniform magnetic field of magnitude 0.3 T directed normal to the loop. What is the emf developed across the cut if the velocity of the loop is 1 cm s−1 in a direction normal to the
- longer side,
- shorter side of the loop?
For how long does the induced voltage last in each case?
What do you understand by the term "electromagnetic induction"? Explain with the help of a diagram.
Describe different ways to induce current in a coil of wire.
What is an electromagnet?
What is an electromagnet? What do you know about the simplest form of an electromagnet?
Fleming's left hand rule : electric current : : Fleming's right hand rule : _______
Find the odd one out and give its explanation.
Using Lenz’s law, predict the direction of induced current in conducting rings 1 and 2 when the current in the wire is steadily decreasing.
What should be the core of an electromagnet?
