Question: A 125-turn rectangular coil of wire is hung from one arm of a balance, as the figure shows. With the magnetic field turned off, an

A 125-turn rectangular coil of wire is hung from one arm of a balance, as the figure shows. With the magnetic field turned off, an object of mass M is added to the pan on the other arm to balance the weight of the coil.
Concepts:
(i) In a balanced, or equilibrium, condition the device has no angular acceleration. What does this imply about the net torque acting on the device?
(ii) What is torque?
(iii) In calculating the torques acting on an object in equilibrium, where do you locate the axis of rotation?
Calculations: When a constant 0.200-T magnetic field is turned on and there is a current of 8.50 A in the coil, how much additional mass m must be added to regain the balance?

Axis 125-turn coil 0.01 50 m- 18 (into paper)

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