A circular coil has a diameter of 20cm and contains 10 loops. The coil is placed in a 2.0 T external magnetic field. What current must be supplied to this coil in order to make the maximum torque on the current loop 1.88Nm during operation of the loop in a motor

To solve this problem we will apply the concepts related to the Torque depending on the current (Number of turns, magnetic field and magnetic dipole moment). From these values we can find the required current value.

First at all, our values are,

The torque and a current loops is given as

Here,

N = Number of loops

M = Magnetic dipole moment

B = Magnetic field

the Maximum value will be given when is equal to 1, then

Remember that the magnetic dipole moment is equal to the product between the current and the cross sectional area, then

Rearranging to find the current

Replacing with our values we have,

Therefore the current must be 3A.

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