question_answer

Figure shows a metre bridge, wire AC has uniform cross-section. The length of wire AC is 100 cm. X is a standard resistor of 4 Q and Y is a coil. When Y is immersed in melting ice the null point is at 40 cm from point A. When the coil Y is heated to \[100{}^\circ C,\] a\[78\text{ }\Omega \]. resistor has to be connected in parallel with Fin order to keep the bridge balanced at the same point. The temperature coefficient of resistance of the coil is \[M\times {{10}^{-4}}{{K}^{-1}}\] Find the value of M?

Answer:

8.3