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Advantages of A.C. transmission of power
1. The power can be produced at high voltages.
2. The maintenance of a.c. sub-stations is simple and cheaper.
3. The a.c. voltage can be stepped up or stepped down by transformers with simplicity and efficiency. This permits to transfer power at high voltages and distribute it at safe potentials.
Surface crystallography and epitaxy. Fe thin films are grown on a single-crystal Al(100) substrate surface. The films grow with no dislocations (if they are thin enough) with sug
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1 Volt : Potential difference among two points will be 1 volt if 1 joule of work is needed to move a +ve charge of Coulumb from 1 point to another.
12 joule of work has to be completed against an existing electric field to take a charge of 0.01 C from A and B. How much is the potential difference VB-VA.
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examples of unlike parallel forces
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