9. A current-carrying wire 32.8 cm long is in a magnetic field of strength 0.452 T. The wire experiences a magnetic force of 2.25 N. The angle between the field and the wire is 25.0°. What is the current in the wire? [3T,1C]

The current though a wire is perpendicular to a 2.85-T magnetic field. If the current in the wire is 2.25-A and the length of the wire is 5.50-m long, what is the magnitude of the force on the wire?

9. A electron with charge -1.60 × 10-19 C and mass 9.11 × 10-31 kg is accelerated from rest through 14.20 kV. It then enters a uniform magnetic field of 7.50 x 10-4 T that is oriented perpendicular to its direction of motion. (a) What is the radius of the path the electron follows in the magnetic field? (b) How long does it take the electron to make one complete circle in the magnetic field?

5. A current through a wire is in the +x direction in the presence of an external magnetic field that points in the +y direction. In what direction does the magneitc force on the wire point?

4. Please refer again to the diagram. This time we have a charge of 3.86 x 10^-6 C moving at velocity 7.00 x 10^5 m/s through a magnetic field of strength 1.28 T and an electric field of strength 8.92 x 10^5 N/C. What is the magnitude of the total force on this charge?     0.02 N     0.01 N     0.03 N     0.03 N

1. A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

Note: The problems and reading are a continuation of reading on Magnetic Fields. Show all your work to arrive at a formulation for problems if necessary. A complete formulation without having to substitute numbers is sufficient as an answer.

9. A helium nucleus (2 protons, 2 neutrons) is traveling at a velocity of 4.33 x 10^6 m/s a distance of 4.52 cm away from a wire carrying a current of 1.40 A. The helium nucleus is traveling in a direction parallel to the current in the wire. How much acceleration does the helium nucleus experience due to the magnetic force from the current in the wire?     1.54E+09 m/s^2   2.05E+09 m/s^2   1.28E+09 m/s^2   5.12E+08 m/s^2

A straight wire in a magnetic field experiences a force of 0.032 N when the current in the wire is 1.5 A. The current in the wire is changed, and the wire experiences a force of 0.074 N as a result. What is the new current?

5. Once more, please refer to the figure. This time the charge is 7.98 x 10^-6 C, the magnetic field strength is 2.68 T and the electric field strength is 1.70 x 10^5 N/C. The charge experiences a total force of magnitude 15.00 N as it enters the region. What is its speed as it enters the region?   1.08E+06 m/s   6.38E+05 m/s   4.47E+05 m/s   9.57E+05 m/s