Question

The circuit shown below has a variable resistor connected to a 6.0 V battery. What amount of current flows through the battery when the variable resistor is set for 4 ohms? *
3 points
Captionless Image
1.5 A
1.0 A
0.75 A
0.50 A
Two particles with the same positive charge are 100 cm apart. What happens to the electric force between the two particles when the charge on each particle doubles? *
2 points
The electric force becomes attractive.
The magnitude of the electric force decreases.
The attractive electric force becomes two times as strong.
The repulsive electric force becomes four times as strong.

A student creates a circuit with a variable voltage supply and a 2 ohm resistor. The student varies the voltage and measures the current. The graph below shows the student’s results. What was the greatest power supplied by the battery? *
3 points
Captionless Image
2 W
4 W
8 W
16 W

A student builds a simple circuit and places a magnet under one of the circuit’s wires. When the switch is closed, charges flow in the circuit and the wire moves, as shown in the diagram below. Which question is the student most likely trying to answer? *
2 points
Captionless Image
Does a positive charge build up in the wire?
Does a negative charge build up in the wire?
Does the current in the wire create a magnetic field?
Does the current in the wire cause the wire to heat up?

Which statement describes what most likely occurs when a magnetic compass is placed next to a simple circuit made from a battery, a light bulb, and a wire? *
2 points
A magnetic field created by the compass causes the light bulb to stop working.
A magnetic field created by the electric current causes the compass needle to move.
A magnetic field created by the compass increases the current in the electrical circuit.
A magnetic field created by the electric current places negative charges on the compass.

Which of the following is labeled by the letter A in the diagram below? *
2 points
Captionless Image
battery
wire
switch
resistor
Which of the following is labeled by the letter B in the diagram below? *
2 points
Captionless Image
battery
wire
switch
resistor

Answer 1

Answer:

1.) 1.5 A

2.) The repulsive electric force becomes four times as strong.

3.) 8 W

4.) Does the current in the wire create a magnetic field?

5.) A magnetic field created by the electric current causes the compass needle to move.

6.) Resistor

7.) Battery

Explanation:

1.) Let's use ohms law. V = IR

Current I = 6/4 = 1.5 A

2.) Since the particles are of same charges, the will experience a repulsion electric force. As their charges doubled, The repulsive electric force becomes four times as strong. Because the repulsive force between is proportional to the product of the two magnitude of charges.

3.) Since power P = IV

Greatest power supplied will be the product of maximum current and voltage

P = 2 × 4 = 8 A

4.) Does the current in the wire create a magnetic field?

There was a magnetic repulsion when the switch was closed because of the magnetic field created by the current in the wire.

5.) A magnetic field created by the electric current causes the compass needle to move.

6.) That is the symbol of a resistor

7.) That is the symbol of a cell or Battery