Magnetic Fields and Forces Homework
1.
A wire 0.10 m long carrying a current of 2 A is at right angles to a magnetic field.
The force on the wire is 0.04 N. What is the strength of the magnetic field? What
would its strength be if the wire is at an angle of 35
°
to the field? Ans: 0.20 T;
0.35 T
2.
A wire 0.50 m long carrying a current of 8 A is at an angle of 15
°
to a 0.40 T
field. What is the magnetic force exerted on the wire? Ans: 0.41 N
3.
A beam of electrons moves at right angles to a 0.60 T field. The electrons have a
velocity of 2.5 x 10
7
m/s. What force acts on the electrons? What force acts if the
beam of electrons move at an angle of 45
°
to the field? Ans: 2.4 x 10
12
N; 1.7 x
10
12
N
4.
A proton moves at right angles to a 0.003 T field directed out of the page. The
proton moves from right to left with a speed of 5 x 10
6
m/s. What is the
magnitude and the direction of the force the proton experiences? Ans: 2.4 x 10
15
N, towards the top of the page
5.
Two parallel wires separated by 150 cm carry currents of 5 A and 15 A in
opposite directions. What is the strength of the net magnetic field between the
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 Spring '08
 Kruse,M
 Physics, Current, Force, Work, Magnetic Field, 3 cm, 30 cm, 15°, 20 M

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