3/ Imagine a wire sticking out of center of a clock. If there iscurrent in the wire that is traveling out of the face of the clock,towards you, what is the direction of the magnetic field created bythe current?
Select one:
a. Clockwise
b. Counter-clockwise
c. Upward (from the 6 to the 12)
d. Downward (from the 12 to the 6)
e. In the same direction as the current (toward you)
4/ A magnetic field points to the right across your computerscreen. If a positive charge is moving to the left across yourcomputer screen, what is the direction of the force on the chargefrom the magnetic field?
Select one:
a. Up the screen
b. Down the screen
c. To the right
d. To the left
e. Out of the screen
f. Into the screen
g. There is no force
5/ A current moving in a long, straight wire creates a magneticfield. How does the magnetic field change if the current weremoving in the opposite direction through the wire?
Select one:
a. There would be no magnetic field.
b. The magnetic field changes direction also.
c. The magnetic field becomes stronger.
d. The magnetic field becomes weaker.
e. The magnetic field would not change.
6/ At the Large Hadron Collider at CERN, protons travel atnearly the speed of light in a large circle. The protons are pushedin this circle by magnetic fields. What does the direction of themagnetic fields have to be so that the protons travel clockwisewhen looking at their path from space?
Select one:
a. The magnetic field points clockwise
b. The magnetic field points counterclockwise
c. The magnetic field points into the ground
d. The magnetic field points out of the ground
e. The magnetic field points towards the north.
7/ Which of the follow can the magnetic force can change about amoving charged particle? Select all correct answers.
Select one or more:
a. The speed of the particle
b. The direction the particle moves in
c. The charge of the particle
d. The mass of the particle
e. The velocity of the particle
8/ In a region of space, a magnetic field points north and anelectric field points west. An electron moving at a certainvelocity feels no net force when traveling through this region. Ifa proton moves with exactly the same velocity as the electron(speed and direction), what can you say about the force on theproton?
Select one:
a. Both the electric force and the magnetic force will changedirection, so there will also be no net force on the proton.
b. The magnetic force on the proton will become larger than theelectric force - so the proton will feel a net force.
c. The magnetic force on the proton will become smaller than theelectric force - so the proton will feel a net force.
d. Only the magnetic force will change direction, so the protonwill feel a force.
e. Only the electric force will change direction, so the protonwill feel a force.
9/ A current carrying wire in a magnetic field feels an eightNewton force to the right. How does the force change if the lengthof wire inside the field is reduced by half?
Select one:
a. The magnitude of the force becomes two Newtons. The directiondoes not change.
b. The force does not change.
c. The magnitude of the force becomes four Newtons. Thedirection does not change.
d. The magnitude of the force becomes sixteen Newtons. Thedirection does not change.
e. The force stays the same magnitude, but changesdirection.
10/ Coil A contains 8 loops of wire and has an area of 4 squaremeters. Coil B has 16 loops of wire and has an area of 2 squaremeters. If the coils have the same current and are arranged thesame inside a magnetic field, which coil experiences a largertorque?
Select one:
a. Coil A because it has a larger area
b. Coil A because it has fewer loops of wire.
c. Coil B because it has a smaller area.
d. Coil B because it has more loops of wire.
e. They experience the same torque.
