Instructions

A nichrome wire AB, 100 cm long and of uniform cross section is mounted on a meter scale, the points and B coinciding with 0 cm and 100 cm marks respectively. The wire has a resistance S = 50 ohm. Any point

C along this wire, between A and B is called a variable point to which one end of an electrical element connected. In the following questions this arrangement will be referred to as ‘wire AB’.

Question 51

The emf of a battery is determined using the following circuit with 'wire AB'. The galvanometer shows zero deflection when one of its terminals is connected to point C. If the internal resistance of the battery is 4 ohm, its emf is

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