Measurement of Self Inductance by Maxwell Bridge            

A Maxwell’s inductive bridge shown in figure below is used to measure an unknown inductance in comparison with known inductance. The values at balance R₂= 500Ω, R₄=600Ω, R₃= 1000Ω, r₂=100Ω and L₂= 2mH. Calculate the values of R₁ and L₁ . Calculate also the Q-factor of the coil if frequency is 1000Hz.

A moving coil ammeter has a uniform scale with 50 division and gives a full scale reading 10 A. The instrument can read up to (1/5)th of a scale division with a fair degree of certainty. What is the resolution of the instrument in mA?