1. A particle with a charge of 0.8 C is moving at right angles to a uniform magn
ID: 2243761 • Letter: 1
Question
1. A particle with a charge of 0.8 C is moving at right angles to a uniform magnetic field with a strength of 0.4 T. The velocity of the charge is 720 m/s. What is the magnitude of the magnetic force exerted on the particle?
N
2. Two long parallel wires, each carrying a current of 10 A, lie a distance of 7 cm from each other. What is the magnetic force per unit length exerted by one wire on the other?
N/m
3. A horizontal wire is oriented along a north-south line, and a compass is placed above it. Will the needle of the compass deflect when a current flows through the wire, and if so, in what direction?
Explanation / Answer
1)
force = qvB
where q is charge
v is velovity
B is magnetic field
so force is
F=0.8*0.4*720
=230.4
2)
The force per unit length between two wires is
f=uI(1)*I(2)/2*pie*d
where I(1) is current in one wire
while I(2) is current in another wire
u is magnetic permiebility
d is distance between wires
u=4*pie*10^-7
f=4*pie*10^-7*10*10/2*pie*7
=28.57*10^-7
3)
Yes, the needle will deflect directly east
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