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In this lesson, we will learn how to calculate the magnitude of the magnetic dipole force that acts on a current-carrying loop in a uniform magnetic field.

Q1:

The permanent magnets in an electric motor lose 5 . 0 % of their strength.

By how many percent is the torque of the motor decreased?

How many percent would the current to the motor need to be increased to compensate for the loss of torque by the motor?

Q2:

A square loop of wire has a side length of 24.3 cm and consists of 210 turns of wire. The loop is placed in a uniform magnetic field. When a 45.5 A current is supplied to the loop, a maximum torque of magnitude 300 N⋅m is exerted on the loop. What is the magnitude of the magnetic field?

Q3:

A current-carrying coil in a magnetic field experiences a torque that is 6 7 % of the maximum possible torque that the field can exert on the coil. What is the angle between the magnetic field and the line normal to the coil’s axis?

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