short note on thumb rule
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A rule of thumb is an informal principle that is intended to provide general guidance rather than precise direction. People once used the phrase rule of thumb in reference to a rough physical measurement, but the term has evolved to apply to any kind of broadly applicable and imprecise rule
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Explanation:
Right hand thumb rule states that,
A current carrying conductor has a magnetic feild around it. To find the direction of the magnetic field use your right hand and point your thumb in the direction of the current the try to grab the conductor so the curling of your rest four finger will give the direction of the magnetic field.
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