Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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# Physics problems:magnetism

Part 2

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.

Solution

Problem 12.

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

Solution

Problem 13.

A circular disk of radius  spins at constant angular velocity  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 ?

Solution

Problem 14.

A particle with charge of  enters the region of uniform magnetic field with speed of  at an angle of  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  and the magnitude of the magnetic field is 0.1 T.

Solution

Problem 15.

Two wires cross at a  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.

Solution

Problem 16.

Two wires cross at a  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.

Solution

Problem 17.

Two wires cross at a  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.

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

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 . What is the magnitude of the torque on the current loop?

Solution

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