22. A cylindrical wire of resistance R is pulled to thrice
its length keeping the volume constant. What will
be its new resistance?
(A) R
(C) 9R
(B) 3R
(D) 27R
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cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field. B with the distance d from the centre of the conductor, is correctly represented by the figure
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the answer is here in the picture
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