What is the maximum torque on a 400-turn circular coil of radius 0.65 cm that carries a current of 1.2 mA and resides in a uniform magnetic field of 0.2 T? Answer in units of N · m.

Torque,

Explanation:

Given that,

Number of turns in a circular coil, N = 400

Radius of the circular coil, r = 0.65 cm

Current in the coil, I = 1.2 mA

Uniform magnetic field in the circular coil, B = 0.2 T

Torque in the circular coil is given by :

For maximum torque,

So, the net torque about the vertical axis is . Hence, this is the required solution.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west