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Magnetic Field due to Solenoid

4.A long stra...

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4.A long straight hollow metallic tube carrying a current I has three sections of different area of cross section as shown in the figure. 3 points A B and C are on the line parallel to the axis of the tube if magnetic field at these points are B1 B2 and B3 respectively then what is the relation between B1 , B2 and B3

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