Question

122-A galvanometer shows a deflection of 36 degrees for a current of 3,6mA when a rectangular coil of area 30cm x 30cm with 100 turns of wire is suspended with the value of B=4x10^{-2 , find the torsional constant of the suspension wire}

^{122B-A delta network has the following values R}_AB =120ohms, R_BC=150ohms, R_CA=200ohms

calculate the values of the equivalent star network

Answer 1

Solution:

122-A:

Torsional constant = 3.6x10^-5 Nm/degree --- (Unit is Newton-meter/degree)

(If the answer is required in Nm/radian, the result will be 2.063x10^-3 Nm/rad.)

122-B:

Resistance of equivalent star network:

R_A = 51.064 Ohms

R_B = 38.298 Ohms

R_C = 63.83 Ohms

Please refer the attached image files (2 pages) for the calculation details and relevant diagrams.

Please let me know, in case of any clarifications.