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Physics problems: magnetism

Part 3

 

Problem 21.

What is the magnitude of a torque on a square loop shown in the figure?.

current

Solution

 

Problem 22.

A cross section through three long wires with linear mass density of 2 g/m is shown in the figure. They each carry equal currents. The lower two wires are attached to a table, while the third wire is free to move. What current will allow the third wire to float so as to form an equilateral triangle with two other wires?

current

Solution

 

Problem 23.

What is the magnetic flux through the loop shown in the figure?

 

fiield

Solution

 

Problem 24.

Find the magnetic flux through the loop shown in the figure.

 

flux

Solution

 

Problem 25.

What is the magnetic flux through the loop shown in the figure?

 

magnetic flux

Solution

 

 

Problem 26.

There is a clockwise induced current in the conducting loop shown in the figure. Is the magnetic field inside the loop increasing or decreasing in strength?

 

magnetic flux

Solution

 

Problem 27.

There is a counterclockwise induced current in the conducting loop shown in the figure. Is the magnetic field inside the loop increasing or decreasing in strength?

 

magnetic flux

Solution

 

Problem 28.

There is a counterclockwise induced current in the conducting loop shown in the figure. Is the magnetic field inside the loop increasing or decreasing in strength?

 

magnetic flux

Solution

 

Problem 29.

The magnitude of the magnetic field shown in the figure increases with time. What is the direction of current in the loop?

 

magnetic flux

Solution

 

Problem 30.

The magnitude of the magnetic field shown in the figure increases with time. What is the direction of current in the loop?

 

magnetic flux

Solution

 

 

 

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