Two parallel wires are vertical. The one on the left carries a 10-A current upward. The other carries 5-A current downward.
Compare the magnitude of the force that each wire exerts on the other.
The two wires exert the same force on each other.
Which of the following statements about the force on a charged particle due to a magnetic field are not valid?
Check all that apply.
It depends on the particle's velocity.
It depends on the strength of the external magnetic field.
It acts at right angles
None of the above; all of these statements are valid.
For a charged particle, a constant magnetic field can be used to change
only the direction of the particle's velocity.
only the magnitude of the particle's velocity.
both the magnitude and direction of the particle's velocity.
None of the above.
only the direction of the particle's velocity.
A proton enters a uniform magnetic field that is perpendicular to the proton's velocity
What happens to the kinetic energy of the proton?
What happens to the kinetic energy of the proton?
It increases.
It decreases.
It stays the same.
It depends on the ve
It stays the same.
No work done, so KE will not change
Which way do the magnetic field lines produced by this wire point?
They point away from the wire.
They point parallel to the wire in the direction of the current.
They point parallel to the wire opposite the direction of the current.
They point toward the
They make circles around the wire.
Which of the following statements is false? The magnetic field of a current-carrying wire
Which of the following statements is false? The magnetic field of a current-carrying wire
exists only if the current in the wire is changing.
is directed circularly
exists only if the current in the wire is changing.
Which statements about the force on a charged particle placed in a magnetic field are true?
Check all that apply.
Check all that apply.
A magnetic force is exerted only if the particle is moving.
A magnetic field always exerts a force on a charged particl
A magnetic force is exerted only if the particle is moving.
As a proton moves through space, it creates
As a proton moves through space, it creates
an electric field only.
a magnetic field only.
both an electric field and magnetic field.
nothing; the electric field and magnetic fields cancel each other out.
both an electric field and magnetic field.
???
When a charged particle moves parallel to the direction of a magnetic field, the particle travels in a
When a charged particle moves parallel to the direction of a magnetic field, the particle travels in a
straight line.
helical path.
circular path.
hyste
straight line.
Indicate which of the following will produce a magnetic field:
Check all that apply.
A moving electric charge.
The Earth.
A piece of any metal.
A magnet.
An ordinary piece of iron.
An electric current.
An electric charge at rest.
The voltage of a battery
A moving electric charge.
The Earth.
A magnet.
An electric current.