A moving charge or current produces what kind of field? At t = 0 a charge q_0 is

Question

A moving charge or current produces what kind of field? At t = 0 a charge q_0 is at rest a uniform magnetic field. There are no other fields present. Discuss the motion of this stationary particle as a function of time. What is the approximate magnitude of the Earth's magnetic field in Pocatello, Idaho? Two long parallel wires placed side-by-side on a horizontal table can identical current straight toward you. From your point of view, what is the magnetic field at the point exactly between the two wires? A charged particle of mass m is injected into a uniform magnetic field such that its velocity vector v is perpendicular to the_magnetic field vector B. Does the magnetic field do work on particle? Why or why not? Qualitatively describe or sketch the motion of the particle. Explain Lenz's law in a sentence or two. How does Lenz's law show up in Faraday's law?

Explanation / Answer

a) magnetic field

b) the charged particle will remain at rest.

because, there is no magnetic force on ststaionary charged particle.

c) 4.5*10^-5 T

d) zero.

because, they produce equal magnetic field but opposite in direction. so, net magnetic field will be zero.

e)

i) no, because magnetic force always perpendicular to instantaneous dispalcement.

W = F*d*cos(90) = 0

ii) uniform circular motion.

f) The direction of induced emf(or current) is always such as to oppose the change in magnetic flux that genereted it.

induced emf = -A*dB/dt

the negative sign indicates Lenz'slaw.

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