# Factors affecting internal resistance of a cell

Jun 17th, 2015
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theory :- The internal resistance of a cell is the resistance offered by its electrolyte to the flow of ions . The internal resistance of a cell• is directly proportional to the distance between the electrodes.• is inversely proportional to facing surface area of the electrodes in electrolyte. • decreases with increase in temperature of electrolyte.

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1. A rectangular coil measuring 20 mm by 35 mm and having 650 turns is rotating about a horizontal axis which is at right angles to a uniform magnetic field of flux density 2.5 103 T. The plane of the coil makes an angle with the vertical, as shown in the diagrams.(a) State the value of when the magnetic flux through the coil is a minimum................................................................................................................................................(1 mark)(b) Calculate the magnetic flux passing through the coil when is 30......................................................................................................................................................................................................................................................................................................(2 marks)(c) What is the maximum flux linkage through the coil as it rotates?.............................................................................................................................................................................................................................................................................................................................................................................................................................................................(2 marks)2. Figure 2 shows a horizontal wire, held in tension between fixed points at P and Q

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