1. Which statement is true about the magnetic field generated by a stationary ch
ID: 1482292 • Letter: 1
Question
1. Which statement is true about the magnetic field generated by a stationary charged particle?
A. It points radially outwards from the charge, like the electric field
B. 0
C. It gets weaker the closer we are to the particle
D. It gets stronger the closer we are to the particle
2. A thick current carrying wire has radius R. The current density (current/area) is not constant, but increases proportional to the square of the distance from the centre of the wire, r. The total current is I. What statement is true about the magnetic field inside (r<R) and outside (r>R) this wire?
A. Inside the wire, magnetic field is proportional to r^2; outside it is the same as for a wire with constant current density.
B. Inside the wire, magnetic field is proportional to r^3; outside it behaves the same as for a wire with constant current density.
C. Inside the wire, magnetic field is proportional to r; outside it behaves the same as for a wire with constant current density.
D. Inside the wire, magnetic field is proportional to r^2; outside it increases proportional to r.
Explanation / Answer
1. Which statement is true about the magnetic field generated by a stationary charged particle?
A. It points radially outwards from the charge, like the electric field
B. 0 (True)
C. It gets weaker the closer we are to the particle
D. It gets stronger the closer we are to the particle
2. A thick current carrying wire has radius R. The current density (current/area) is not constant, but increases proportional to the square of the distance from the centre of the wire, r. The total current is I. What statement is true about the magnetic field inside (r<R) and outside (r>R) this wire?
A. Inside the wire, magnetic field is proportional to r^2; outside it is the same as for a wire with constant current density.
B. Inside the wire, magnetic field is proportional to r^3; outside it behaves the same as for a wire with constant current density. (TRUE) -- total current through a circle of radious r is propitional to r^4
C. Inside the wire, magnetic field is proportional to r; outside it behaves the same as for a wire with constant current density.
D. Inside the wire, magnetic field is proportional to r^2; outside it increases proportional to r.
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