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Production of a magnet:
Magnets can be produced in a variety of ways, generally the method used is determined by the type of magnet required.
Using the stroke method of producing a magnet, a piece of steel is stroked by a permanent magnet or magnets. Backward and forward movement of the steel should be avoided and magnets should follow the assumed lines of force when stroking the steel.
Magnets with same polarity at either end can be produced using the double stroke method. This entails stroking the steel from the centre to the end, reversing the direction of the magnet for each end. Such a magnet is said to have consequent poles.
The birghtness of objects past Neptune actually varies approximately as 1/d^4. Why is that the case?
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Fusion Reaction: In nuclear fusion light nuclei are brought together to form a relation heavier nucleus. They energy free in nuclear fusion is larger than that free in fission.
Derivation
Semi Conductors: Substance which are neither good Conductor, like metals nor very bad conductors like non metals are known as Semi conductors Examples of such substances are si
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Can you explain coherent sources of light?
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