Mod 6 IQ1&2 Quiz

A wire is placed between the poles of a horseshoe magnet. There is a current in the wire in the direction shown, and this causes a force to act on the wire. Three other arrangements, P, Q, and R, of the wire and magnet are set up as shown. Which arrangement or arrangements will cause a force in the same direction as the original arrangement?

• P, Q, and R

• P and Q only

• P only

• R only

The diagram shows a flat, rectangular coil placed between the poles of a magnet. There is a current in the coil that makes it turn in the direction shown in the diagram. Which change would make the coil turn in the opposite direction?

• Decreasing the current in the coil

• Increasing the number of turns on the coil

• Reversing both the direction of the current in the coil and the poles of the magnet

• Reversing only the direction of the current in the coil

A current-carrying wire XY lies in the magnetic field between the two poles of a U-shaped electromagnet. A force acts on the wire XY because of the magnetic field. Each of the following actions is carried out separately:

A. The current in the wire XY is reversed
B. The magnetic field is reversed
C. both the current in the wire XY and the magnetic field are reversed at the same time.

How many of these actions cause the direction of the force on the wire XY to be reversed?

• 0

• 1

• 2

• 3

A metal rod PQ rests on two horizontal metal wires that are attached to a battery. The rod lies between the poles of a magnet. When the switch is closed the metal rod moves right, what change would make the rod move left?

• Open the switch.

• Reverse the battery terminals and exchange the poles of the magnet.

• Reverse the battery terminals but without exchanging the poles of the magnet.

• Turn the metal rod around (P and Q exchanged).

The diagram shows a wire placed between two magnetic poles of equal strength. A current passes through the wire in the direction shown. The current causes a downward force on the wire. What is the arrangement of the magnetic poles?

• S - N

• N - S

• N - N

• S - S

In which direction does a force act on the electron when it enters the magnetic field?

• into the page

• out of the page

• towards the bottom of the page

• towards the top of the page

Which way will the conductor move in this picture?

• Left

• Up

• Right

• Down

A current-carrying wire has its (conventional) current flowing downwards. The wire is in a uniform magnetic field directed out of the page. What direction is the force on the wire?

• left

• right

• into the page

• out of the page

A current-carrying wire has its (conventional) current flowing into the page. The wire is in a uniform magnetic field directed to the right (always N to S). What direction is the force on the wire?

• up

• down

• left

• right

A square loop of wire carrying a current I is initially in the plane of the page and is located in a uniform magnetic field B that points toward the bottom of the page, as shown above. Which of the following shows the correct initial rotation of the loop due to the force exerted on it by the magnetic field?

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