All multiple choices!!! (I chose +z for 1 and 3, both are wrong) The Hall effect

Question

All multiple choices!!! (I chose +z for 1 and 3, both are wrong)

The Hall effect can be used to determine the sign of the mobile charges in a particular conducting material.

A bar of a new kind of conducting material is connected to a battery as shown. In this diagram, the x-axis runs to the right, the y-axis runs up, and the z-axis runs out of the screen, toward you. A voltmeter is connected across the bar as shown, with the leads placed directly opposite each other along a vertical line. In order to answer the following questions, you should draw a careful diagram of the situation, including all relevant charges, electric fields, magnetic fields, and velocities.

Now large coils (not shown) are moved near the bar, and current runs through the coils, making a magnetic field in the -z direction (into the page).

1. If the mobile charges in the bar are negative, what is the direction of the magnetic force on the mobile charges?
2. If the mobile charges in the bar are negative, which of these things will happen? (Select one)

Negative charge will accumulate on the left end of the bar.

Positive charge will accumulate on the top of the bar.    

The bar will not become polarized.

Negative charge will accumulate on the top of the bar.

3. If the mobile charges in the bar are positive, what is the direction of the magnetic force on the mobile charges?
4. If the mobile charges in the bar are positive, which of these things will happen? (Select one)

Positive charge will accumulate on the right end of the bar.

Positive charge will accumulate on the top of the bar.    

Negative charge will accumulate on the top of the bar.

The bar will not become polarized.

5. You look at the voltmeter and find that the reading on the meter is -0.0005 volts. What can you conclude from this observation? (Remember that a voltmeter gives a positive reading if the positive lead is attached to the higher potential location.) (Select one)

The mobile charges are positive.

There is not enough information to figure out the sign of the mobile charges.    

The mobile charges are negative.

Explanation / Answer

1) –y

2) Negative charge will accumulate on the top of the bar.

3) –y

4) Positive charge will accumulate on the top of the bar.   

5) The mobile charges are negative.

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