1. Two long bar magnets, positioned on a table with their north poles facing each other, exert a force of 5.0 N on each other. If the distance between these two poles is doubled what is the new value of the force between them?   Answer (32.0K)

2. A particle with a positive charge of 0.006 C is moving parallel to a magnetic field of strength 0.3 T. The particle has a speed of 400 m / s . Calculate the magnitude of the magnetic force exerted on the particle.   Answer (28.0K)

3. A particle with a positive charge of 0.006 C is moving perpendicular to a magnetic field of strength 0.3 T. The particle has a speed of 400 m / s . Calculate the magnitude of the magnetic force exerted on the particle.   Answer (33.0K)

4. The direction of the velocity of the particle in the previous problem is toward the top of this page and the direction of the magnetic field strength is into the page. Find the direction of the magnetic force on the particle.   Answer (30.0K)

5. A straight segment of wire has a length of 30 cm and carries a current of 4.0 A. It is oriented at right angles to a magnetic field of 0.3 T. What is the magnitude of the magnetic force on this segment of the wire?   Answer (32.0K)

6. A coil of wire of one turn has a cross-sectional area of 0.08 m². A magnetic field of 0.4 T passes through the coil parallel to the plane of the coil. What is the total magnetic flux through the coil?   Answer (29.0K)

7. A coil of wire of one turn has a cross-sectional area of 0.08 m². A magnetic field of 0.4 T passes through the coil perpendicular to the plane of the coil. What is the total magnetic flux through the coil?   Answer (40.0K)

8. The magnetic flux through a coil of wire changes from 7.0 T m² to 1.0 T m² in 2.0 seconds. What is the magnitude of the average voltage induced in the coil during this change?   Answer (42.0K)

9. A step-down transformer in a door bell is used to convert 120 Volts a.c. to 12 Volts a.c. If the primary coil has 300 turns, how many turns must the secondary coil have?   Answer (37.0K)

10. A step-up transformer is used to convert 2000 Volts a.c. to 10,000 Volts a.c. If the primary coil has 100 turns, how many turns must the secondary coil have?   Answer (33.0K)