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A coil of 300 turns is wound uniformly on a ring of non-magnetic material. The ring has a mean circumference of 40cm and a uniform cross-sectional area of 4cm2. If the current in the coil is 5 A, calculate
(a) The magnetic field strength,
(b) The flux density and
(c) The total magnetic flux in the ring.
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Two moles of an ideal gas expands reversibly and isothermally to ten times its volume at 25°C. Evaluate the change in entropy during the process. ( R = 8.314 JK -1 mol -1 )
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