1.True or False? The time constant of an RC circuit tells us how much time it ta

Question

1.True or False? The time constant of an RC circuit tells us how much time it takes for the circuit to charge or discharge by 50%.

2.

Suppose I have a uniform magnetic field pointing along the +z direction. I launch an electron in the -z direction with a velocity V. What is the magnitude of the net force on the electron?

3.

4.True or False? I build a velocity selector and use it to filter protons with a certain speed. Since it works for protons (positive charges), it will NOT work for electrons (negative charges).

5.

Two parallel wires carry equal current in the same direction. Will the wires attract or repel each other?

6.

Suppose I have a circular loop of wire with radius R. I run a current I through the loop and measure a magnetic field B at the center of the wire. If I double the radius of the wire and triple the current in the wire, what is the new magnetic field at the center of the wire?

7.True or False? If I draw some imaginary surface in space (either open or closed), the net magnetic flux passing through the surface is zero.

8.

Which type of magnetism is associated with the formation of domains?

Explanation / Answer

1)

False, it 63%

2)

F = 0, you must have a perpendicular component to have a force

Choice 4

3)

Moment is based on torque

Torque = NBIA, so decrease one of those components to decrease torque

Choices 1 and 4

4)

False, it will still work becuase they have the same charge

5)

Same direction means attract

6)

From B = uI/2R, so the changes are 3 for I and 3 for R, that is 3/2

3/2(B) is choice 2

7)

False, sometimes it is zero, but sometimes it is not

8)

Domains happen in permanant magnetic associated with Ferromagnetism

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