For the following questions answer them individually
The current I em units, flowing in a coil of a tangent galvanometer is given by the expression where
r = Mean radius of the galvanometer coil.
N = Numberof turns of the galvanometercoil.
H = Horizontal componentof earth magneticfield.
$$\phi$$ = Deflection of galvanometer magnetic needle.
Which of the following network theorem deals with finding out the circuit values of voltage and current in a restricted portion of the network by replacing the actual source of energy by a single “equivalent voltage source” or by a single “equivalent current source” acting at a terminal pair?