Download WS: Magnetism Combined

WS #3 – Magnetic Forces
1.
es:
What is the direction of the b-field for the
following current carrying wires:
3.
What is the direction of the force for the following charged particle?
4.
What is the direction of the force on the following current carrying wire?
5.
A charged particle is in a magnetic field.
a. How could you make the particle move in a circle? B. straight line? C. helix?
6.
A charge of 0.050 C moved vertically in the field of 0.080 T that is oriented 45 o from the vertical. What speed must the
charge have such that the force acting on it is 10 N?
7.
An electron travels at a speed if 2.0x104 m/s through a uniform magnetic field whose magnitude is 1.2-10-3 T. What is the
magnitude of the magnetic force on the electron if its velocity and the magnetic field
a. Are perpendicular?
b. Make an angle of 45o?
c. Are parallel?
d. Are exactly opposite?
8.
In a linear particle accelerator, a beam of proton travels horizontally northward. To deflect the protons eastward (force is to
the east) with a uniform magnetic field, the field should point in which direction?
9.
A particle with a charge of -5.0x10-4 C and a mass of 2.0x10-9 kg moves at 1.0x103 m/s in the +x-direction. It enters a uniform
magnetic field of 0.20 T that points in the +y-direction.
a. Which way will the particle deflect just as it enters the field?
b. What is the magnitude of the force on the particle just as it enters the field?
2. What is the direction of the current for the
following b-fields:
10. A 2.0 m length of straight wire carried a current of 20 A in a uniform magnetic field of 50 mT whose direction is at an angle
of 37o from the direction of the current. Find the force on the wire.
11. A straight wire 25 cm long is oriented vertically in a uniform horizontal magnetic field of 0.30 T pointing west. What current
(including direction) would cause the wire to the subjected to a force of 0.050 N horizontally North?
12. The maximum household current in a wire is about 15 A. Assume that this current exists in a long, straight wire in a west-toeast direction. What is the magnitude and direction of the magnetic field the current produces 1.0 cm directly below the
wire?
13. A current carrying wire hovers above Mrs. Wright’s desk. The wire is 1.0 m long and has a mass of 0.05kg. If the wire is in a
magnetic field of 2.00 T, what is the current in the wire?