PHYSICS 112 EXAM 2 QUESTIONS AND VERIFIED
ANSWERS
Kirchhoff's law only applies to currents - Answers - false
Two identical bublbs in series will not have the same brightness - Answers - false
If two resistors, R1, R2 are in parallel then the equivalent resistance is always less than
either of R1 or R2's resistance - Answers - true
The amount of current in a circuit depends jointly on the battery's emf and the
resistance of the circuit attached to the battery - Answers - true
A nerve cell can be modeled as an RC circuit - Answers - true
As more resistors are added in parallel across a constant voltage source, the power
supplied by the source increases. - Answers - true
We observe that a moving charged particle experiences no magnetic force. From this
we can definitely conclude that no magnetic field exists in that region of space -
Answers - false
A ring with a clockwise current (as viewed from above the ring) is situated with its center
directly above another ring, which has a counter-clockwise current, as shown in the
figure. Is the direction of the net magnetic force exerted on the top ring due to the
bottom ring upward? - Answers - true
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry
current in the same direction, do the wires pull toward each other? - Answers - true
A charged particle is injected into a uniform magnetic field such that its velocity vector is
perpendicular to the magnetic field lines. Ignoring the particle's weight, the particle will
follow a circular path - Answers - true
A single current-carrying circular loop of radius R is placed next to a long, straight wire,
as shown in the figure. The current I in the wire flows to the right. The current flow in the
loop must be CLOCKWISE to produce a net magnetic field of zero at its center? -
Answers - true
Light or any EM wave can only be modeled as a particle - Answers - false
According to Lenz's law, the induced current in a circuit always flows to oppose the
external magnetic flux through the circuit - Answers - false
ANSWERS
Kirchhoff's law only applies to currents - Answers - false
Two identical bublbs in series will not have the same brightness - Answers - false
If two resistors, R1, R2 are in parallel then the equivalent resistance is always less than
either of R1 or R2's resistance - Answers - true
The amount of current in a circuit depends jointly on the battery's emf and the
resistance of the circuit attached to the battery - Answers - true
A nerve cell can be modeled as an RC circuit - Answers - true
As more resistors are added in parallel across a constant voltage source, the power
supplied by the source increases. - Answers - true
We observe that a moving charged particle experiences no magnetic force. From this
we can definitely conclude that no magnetic field exists in that region of space -
Answers - false
A ring with a clockwise current (as viewed from above the ring) is situated with its center
directly above another ring, which has a counter-clockwise current, as shown in the
figure. Is the direction of the net magnetic force exerted on the top ring due to the
bottom ring upward? - Answers - true
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry
current in the same direction, do the wires pull toward each other? - Answers - true
A charged particle is injected into a uniform magnetic field such that its velocity vector is
perpendicular to the magnetic field lines. Ignoring the particle's weight, the particle will
follow a circular path - Answers - true
A single current-carrying circular loop of radius R is placed next to a long, straight wire,
as shown in the figure. The current I in the wire flows to the right. The current flow in the
loop must be CLOCKWISE to produce a net magnetic field of zero at its center? -
Answers - true
Light or any EM wave can only be modeled as a particle - Answers - false
According to Lenz's law, the induced current in a circuit always flows to oppose the
external magnetic flux through the circuit - Answers - false
