Physics 2 Electric Fields, Circuits, Magnetism

In summary, the conversation discusses a practice test and provides explanations for two problems. In problem 1a, when r is less than the given value R, the equation E = kq/r2 is used with +Ze as q to get E = kZe/R2. In problem 1b, when r is greater than R, it is assumed that E is zero since the enclosed charge is canceling out and when this is plugged into the equation, the result would be zero. The speaker asks for confirmation if this understanding is correct.
  • #1
Adeel Ahmad
45
0
Can someone please help me out with this practice test and provide explanations?
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  • #2
So for number 1 a, when r<R, I take +Ze as q and plug it into the equation E = kq/r2 and get E = kZe/R2. Not sure if that's correct
 
  • #3
Then for number 1 b when r>R, I assume that E is zero since you set a Gaussian surface that encloses the entire thing so you take the enclosed charge which would be zero since it is +Ze and -Ze which cancels. So when you plug that into solve for E, you would get zero. Please lmk if this is correct.
 

1. What is an electric field?

An electric field is a region in space around a charged object where other charged particles experience a force. The strength and direction of the electric field is determined by the magnitude and sign of the charge creating it.

2. How are electric fields and electric potential related?

Electric potential is a measure of the potential energy per unit charge at a certain point in an electric field. In other words, it is the amount of work required to move a unit charge from one point to another in the electric field. The electric potential is directly proportional to the strength of the electric field.

3. What is the difference between a series and parallel circuit?

In a series circuit, the components are connected in a single loop, so the current has only one path to flow through. In a parallel circuit, the components are connected in multiple branches, providing more than one path for the current to flow through. This affects the overall resistance and current in the circuit.

4. How do magnets work?

Magnets work by creating a magnetic field, which is a region in space where magnetic forces act on other magnets or magnetic materials. This is due to the alignment of the atoms in the magnet, which creates a north and south pole. Opposite poles attract, while like poles repel.

5. What is the right hand rule in magnetism?

The right hand rule is a way to determine the direction of the magnetic field around a current-carrying wire or a moving charged particle. If the thumb points in the direction of the current or velocity, then the curled fingers will point in the direction of the magnetic field.

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