According to Kirchhoff’s Junction Rule, the sum of the currents entering a junction must equal:

The sum of the currents leaving the junction

The voltage across the junction

The time interval of the circuit

What is the SI unit of the permeability of free space (μ₀)?

Tesla meter per Ampere (T·m/A)

Which of the following best describes the magnetic field strength in terms of the Tesla?

It is the magnitude of the force experienced by a one-meter length of wire carrying a current of one ampere perpendicular to the magnetic field.

It is the force exerted on a charge moving through the magnetic field.

It is the field produced by a current-carrying wire.

It is the strength of the magnetic field in a permanent magnet.

Which of the following is true about a magnetic field of strength 1 Tesla?

It produces a force of 1 Newton on a 1-meter-long wire carrying a current of 1 Ampere at a right angle to the magnetic field.

It produces no force on a wire unless the current is 0.5 Amperes.

It produces a force of 1 Ampere on a wire carrying 1 Coulomb of charge.

It is equivalent to the strength of a gravitational field on Earth.

The magnetic field strength B at a point due to a long straight wire is given by the equation B=μ0I/(2πr). If the current I is doubled, what happens to the magnetic field strength at the same distance r?

The magnetic field strength increases by a factor of 4.

The magnetic field strength is halved.

The magnetic field strength doubles.

The magnetic field strength is unaffected.

In the formula F=qvB, what does 'v' represent?

Force exerted by the magnetic field

What happens to the magnetic field strength as you move farther away from a straight current-carrying wire?

It decreases inversely with distance.

The Earth's magnetic field is approximately 25 to 65 microteslas (μT). How does this compare to the strength of a magnetic field of 1 Tesla?

The Earth's magnetic field is much weaker.

The Earth's magnetic field is much stronger.

The Earth's magnetic field is the same strength.

The Earth's magnetic field does not have a measurable strength.

Which of the following uses magnetic fields of strength measured in Tesla?

MRI (Magnetic Resonance Imaging) machines

Electric Current and Circuits Quiz

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79 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the SI unit of electric current (i)?

Coulomb (C)

Volt (V)

Ampere (A)

Ohm (Ω)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the formula i = dq/dt, what does 'dq' represent?

Time

Electric charge

Voltage

Resistance

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the SI unit of the net charge 'dq'?

Ampere (A)

Coulomb (C)

Volt (V)

Tesla (T)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the formula i = dq/dt, what is the SI unit of time 'dt'?

Ampere (A)

Volt (V)

Second (s)

Ohm (Ω)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the SI unit of current density (J)?

Ampere (A)

Ampere per square meter (A/m²)

Volt (V)

Ohm (Ω)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the formula J = i / A, what does 'A' represent?

Electric current

Area

Potential difference

Time

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the SI unit of the area 'A' in the equation for current density?

Meter (m)

Ampere (A)

Square meter (m²)

Volt (V)

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Electric Current and Circuits Quiz

What is the SI unit of electric current (i)?

In the formula i = dq/dt, what does 'dq' represent?

What is the SI unit of the net charge 'dq'?

In the formula i = dq/dt, what is the SI unit of time 'dt'?

What is the SI unit of current density (J)?

In the formula J = i / A, what does 'A' represent?

What is the SI unit of the area 'A' in the equation for current density?

What is the SI unit of resistance (R)?

In the formula R = ρ * (L / A), what does ρ represent?

What is the SI unit of resistivity (ρ)?

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