Physics

posted by .

The maximum torque experienced by a coil in a 0.90 T magnetic field is 8.4 10-4 N·m. The coil is circular and consists of only one turn. The current in the coil is 3.9 A. What is the length of the wire from which the coil is made?


Please tell me if I am going in the right direction.

Torque = NIAB sin theta
8.4x10^-4 = 1 x 3.9 x (pi r^2) x 0.9 x sin theta

How do I find the value of sin theta to plug into the formula?

  • Physics -

    They give you the maximum torque, and that corresponds to theta = 90 degrees
    (sin theta = 1)
    Solve for r.
    N = 1 in this case

    The length of the wre is 2 pi r

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics II

    sUPPOSE YOU HAVE A square coil and a triangular coil each have sides of length L. The triangular coil has twice as many turns as the square coil. If a the same current is sent through each coil, when the coils are placed in the same …
  2. physics

    A 35 turn coil of radius 4.9 cm rotates in a uniform magnetic field having a magnitude of 0.53 T. If the coil carries a current of 20 mA, find the magnitude of the maximum torque exerted on the coil.
  3. Physics 2

    A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?
  4. Physics 2

    A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?
  5. Physics

    You have a wire of length L = 2.1 m for making a square coil of a dc motor. The current in the coil is I = 1.8 A, and the magnetic field of the motor has a magnitude of B = 0.32 T. Find the maximum torque exerted on the coil when the …
  6. Physics

    A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
  7. Physics

    A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
  8. physics

    A circular coil with a radius of 25 cm has 20 turns. The coil is oriented perpendicularly to a magnetic field whose initial magnitude is 3.2 T. Suddenly, the magnetic field vanishes in 0.4 s. a. What is the initial magnetic flux in …
  9. Physics

    A square coil with 30 turns has sides that are 18 cm long. When it is placed in a 0.31-T magnetic field, a maximum torque of 0.60 N⋅m is exerted on the coil. What is the current in the coil?
  10. physics

    A 47.5-turn circular coil of radius 5.15 cm can be oriented in any direction in a uniform magnetic field having a magnitude of 0.490 T. If the coil carries a current of 22.9 mA, find the magnitude of the maximum possible torque exerted …

More Similar Questions