Electromagnets

Question 1

A student measures the magnetic force produced by an electromagnet while varying the current. The data collected are: Current (A) | Magnetic force (N) 0.5 | 2 1.0 | 8 1.5 | 18 Which question would best help the student determine the factor that affects the strength of the magnetic force?

Accepted Answer

How does changing the current, measured in amperes, affect the magnetic force?

Answer

How does the color of the wire affect the magnetic force?

Answer

How does changing the voltage, measured in volts, affect the magnetic force?

Answer

How does changing the length of the wire in the coil affect the magnetic force?

Question 2

Data from three identical wire loops shows the following results: Loop 1: current = 2 A, magnetic force = 0.4 N Loop 2: current = 4 A, magnetic force = 1.6 N Loop 3: current = 6 A, magnetic force = 3.6 N Which statement best explains how the current affects the magnetic force and correctly defines the unit of current?

Accepted Answer

The magnetic force becomes larger as the current increases; current is measured in amperes (A), which is the rate at which charge flows around a circuit.

Answer

The magnetic force becomes smaller as the current increases; current is measured in amperes (A), which is the rate at which charge flows around a circuit.

Answer

The magnetic force becomes larger as the current increases; current is measured in volts (V), which represent the energy transferred per unit charge.

Answer

The magnetic force stays the same regardless of current; current is measured in amperes (A), which is the amount of electric charge stored in a battery.

Question 3

A scientist measures the magnetic force between two identical bar magnets while changing the distance between them. The data are shown below. Distance (cm) | Force (newtons) ----------------|---------------- 2 | 12.0 4 | 3.0 6 | 1.3 8 | 0.75 Which question would best help the scientist use this data to determine which factor most influences the strength of the magnetic force between the two magnets?

Accepted Answer

How does changing the distance between the magnets affect the measured force?

Answer

How does changing the material of the magnets affect the measured force?

Answer

How does changing the strength of the magnets affect the measured force?

Answer

How does changing the shape of the magnets affect the measured force?

Try three questions

A student measures the magnetic force produced by an electromagnet while varying the current. The data collected are: Current (A) | Magnetic force (N) 0.5 | 2 1.0 | 8 1.5 | 18 Which question would best help the student determine the factor that affects the strength of the magnetic force?

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