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Physics problems: magnetism

magnetic force on moving charge

 

and current-carrying wires

 

Problem 1.

Two long straight wires carrying the same current I and separated by a distance r exert a force F on each other. The current is increased to 4I and the separation is reduced to r/6 . What will be the force between two wires?

Solution

 

Problem 2.

Two long straight wires carrying the same current 15 A  exert a force of 0.001 N per unit length on each other. What is the distance between the wires?

Solution

 

Problem 20.

A square loop 4 cm on each side carriers a 0.2 A current. The loop is in 0.5 T magnetic field and an angle between the direction of the magnetic field and the plane of the loop is current. What is the magnitude of the torque on the current loop?

Solution

 

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 75.

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

 

current

Solution

 

 

 

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