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Physics problems: magnetism

Part 1

 

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 3.

The magnetic field strength at a distance of 5 cm from a thin, straight wire is 0.00005 T. What is the current in the wire?

Solution

 

Problem 4.

At what distance from a thin, straight wire the magnetic field strength is 0.000025 T? The current in the wire is 15 A.

Solution

 

Problem 5.

The magnetic field at the center of a 2-cm diameter loop is 0.0005 T. What is the current in the loop? 

Solution

 

Problem 6.

Find the magnetic field strength and its direction at point P.

Solution

 

 

 

Problem 7.

What is the magnetic field strength and its direction at point P?

Solution

 

Problem 8.

Find the strength and the direction of the magnetic field at point P.

Solution

 

Problem 9.

Find the direction and the strength of the magnetic field at point P.

Solution

 

Problem 10.

Find the direction and the strength of the magnetic field at point P for the system of wires shown in the figure.

Solution

 

 

 

 

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