A long straight wire carrying current of 25A rests on a table as shown in the figure. Another wire PQ of length 1m mass 2.5g carries the same current but in the opposite direction. the wire PQ is free opposite direction. The wire PQ is free to slide up and down . To what height will PQ rise ?
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You can't way a concealed wire cause it's in the wall like it was build on the wall so you have to get used to it.
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