Numerical - Calculate torque on coil, given coil specifications, length of a PMMC instrument & magnetic flux density

Q.  The coil diameter and length of a PMMC instrument is 1.2 cm and 1.8 cm respectively. The magnetic flux density in air is 0.1 T and the number of turns is 100. If the current of 1.5 mA is flowing through it then the torque produced on the coil is
- Published on 11 Sep 15

a. 2.58 X 10 -6 N - m
b. 2.92 X 10 -6 N - m
c. 3.24 X 10 -6 N - m
d. 3.92 X 10 -6 N - m

ANSWER: 3.24 X 10 -6 N - m

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