Doubling the current,number of turns,the area,and the ambient magnetic field for a coil changes the maximum torque it experiences by what factor?
A) 2
B) 4
C) 8
D) 16
E) 32

Question

Quizplus · Accepted Answer

The maximum torque experienced by a coil is given by the formula T = (N x B x A x I^2) / (2π). 
Doubling the current (I) and the number of turns (N) will result in a factor of 4 increase in the formula. 
Doubling the area (A) and the ambient magnetic field (B) will result in another factor of 4 increase in the formula. 
Thus, the maximum torque experienced by the coil will increase by a factor of 4 x 4 = 16. So, the correct choice is D.

Doubling the Current,number of Turns,the Area,and the Ambient Magnetic Field