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Physics problems: magnetism

magnetic field due to

 

current-carrying wires

 

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.

field

Solution

 

 

 

Problem 7.

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

current

Solution

 

 

 

Problem 8.

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

field

Solution

 

Problem 9.

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

magnetic

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.

force

Solution

 

Problem 11.

Find the strength and the direction of the magnetic field at point P, which is the center of two circles shown in the figure.

field

Solution

 

Problem 12.

A circular ring of radius electric field spins at constant angular velocity current about an axis through the center of the ring. The ring is uniformly charged with total charge field. What is the strength of the magnetic field at the center of the ring?

Solution

 

Problem 13.

A circular disk of radius electric field spins at constant angular velocity magnetic field about an axis through the center of the disk. What is the strength of the magnetic field at the center of the disk if the disk is uniformly charged with total charge current?

Solution

 

 

 

Problem 14.

A particle with charge of current enters the region of uniform magnetic field with speed of field at an angle of force above the xy-plane. The magnetic field points in the negative z-direction. Find the radius of the particle’s spiral motion. The mass of the particle is electric and the magnitude of the magnetic field is 0.1 T.

Solution

 

Problem 15.

Two wires cross at a field without electric contact. Find the magnitude and the direction of the magnetic field at point P. Point P is 10 cm from the intersection and equally distant from the wires.

force

Solution

Problem 16.

Two wires cross at a force without electric contact. Find the magnitude and the direction of the magnetic field at point P if point P is 10 cm from the intersection and is equally distant from the wires.

force

Solution

 

Problem 17.

Two wires cross at a charge without electric contact as shown in the figure. Find the magnitude and the direction of the magnetic field at point P if point P is 5 cm from the intersection and is equally distant from the wires.

force

Solution

Problem 18.

Magnetic field 10 mT is produced by 10-cm diameter, 20 cm long solenoid. What is the current in the solenoid? The solenoid is tightly wound from 1.0-mm diameter wire.

Solution

 

Problem 19.

A solenoid has a diameter of 20 cm and length of 10 cm. The current in solenoid is 5 A and the total number of turns is 10000. What is the magnetic field inside the solenoid?

Solution

 

 

 

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