Paragraph: A nichrome wire A B, 100 ~cm long and of uniform cross section is mounted on a meter scale, the ₁ and B coinciding with 0 cm and 100 cm marks respectively. The wire has a resistance S=50 ohm . A C along this wire, between A and B is called a variable point to which one end of an electrical ele connected. In the following questions this arrangement will be referred to as 'wire A B '. Question: The emf of a