1)In the case of the force experienced by a charged particle in a magnetic field
ID: 1443157 • Letter: 1
Question
1)In the case of the force experienced by a charged particle in a magnetic field, which of the following two vectors are *always* perpendicular to each other?
a)v and B
b)F and B
c)q and v
d)None of the above
2)Suppose a charged particle is injected to a region of constant magnetic field so that its velocity is perpendicular to the field. Which of the following quantities is zero?
a) acceleration of the particle
b)work done by the magnetic field
c)velocity of the particle
d)radius of the trajectory
3)Consider the magnetic field produced by a current carrying wire. Assume that the direction of the current is called +z. Which of the following statements is true?
a)The field curls around the wire
b)The field gets weaker as you go radially away from the wire (more r, less field)
c)At a given distance from the wire (r), the field is constant
d)The field is independent of z
All of the above
Explanation / Answer
1)
F = q*(V x B) = qVBsin(theta)
here theta is angle between V and B
Force is non zero so V and B should be perpendicular.
2)
work done by the magnetic field should be zero.
ANSWER is b.
3)
magnetic field B = u0*I/(2*pi*r)
all of above is true.
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