BS Physics Fundamentals 3

Question 1

Ohm's law states that the current through a conductor is:

Accepted Answer

Directly proportional to voltage and inversely proportional to resistance

Answer

Ohm's law (V = IR) means current I = V/R — current increases with voltage and decreases with resistance.

Question 2

In a parallel circuit, the total resistance of two resistors is:

Accepted Answer

Less than the smallest individual resistance

Answer

For resistors in parallel, 1/R_total = 1/R₁ + 1/R₂, which always yields a total resistance smaller than either individual resistor.

Question 3

A positive charge moving horizontally through a vertical magnetic field experiences a magnetic force that is:

Accepted Answer

Perpendicular to both its velocity and the magnetic field

Answer

The magnetic force on a moving charge is F = qv × B — a cross product — which is always perpendicular to both the velocity and the magnetic field vectors.

Question 4

Faraday's law of electromagnetic induction states that an EMF is induced in a loop when:

Accepted Answer

The magnetic flux through the loop changes

Answer

Faraday's law states that the induced EMF is proportional to the rate of change of magnetic flux through the conducting loop.

Question 5

According to Coulomb's law, if one of two point charges is tripled while the distance between them remains the same, the electrostatic force:

Accepted Answer

Increases by a factor of 3

Answer

Coulomb's law (F = kq₁q₂/r²) shows the force is linearly proportional to each charge, so tripling one charge triples the force.

BS - Bachelor of Science Practice Test

BS - Bachelor of Science Practice Test

BS Physics Fundamentals 3