Physics 2 Exam Multiple Choice (Spring 2025)

A 100W bulb is left on for one complete day. If the cost of electricity is $0.16 per kWh, the cost to run the bulb for that day is:

$ 0.385

The best explanation explaining why the electric field inside a conductor is zero is

The E-field inside a conductor is cancelled by an opposing E-field

If the electric field produced by an infinite negative plate has a magnitude of E at a distance R for the surface of the plate, what is the magnitude of the electric field a distance of 3R from the plate’s surface?

E

If the length of a conducting wire is doubled, along with its cross-sectional area, the resistance of that wire is:

Unchanged

As a negative charge is approached, the value of the electric potential produced by the charge

Becomes more negative

The best description for the electric field produced by a dipole is

Both convergent & divergent

Why does a charged ballon stick to a neutral wall?

The wall’s atoms are polarized

Two point charges of +Q and +4Q are separated by a distance of 3R. At what distance would the net E-field between them be zero, as measured from the +Q charge?

R

A 9.00 Volt battery is connected to a series circuit which produces 1 Amp of current. The potential difference across the terminal of that battery is

9.00 V

Electric field lines run perpendicular to the normal line coming out of a circular area. The flux through that area is:

Zero

A battery has an EMF of ε = 60.0 V and an internal resistance of r= 8.00 Ω as shown in the figure. When the terminal voltage is V_ab = 36.0V, what is the magnitude and direction of the current flowing through the battery?

3.00 A from b to a

An ideal 110V battery is attached across a series combination of four resistors which have resistance of: 25.0 Ω, 45.0 Ω, 65.0 Ω, and 85.0 Ω. Why is the potent differences across the 45.0 Ω resistor?

22.5 V

A capacitor (which is initially uncharged), a resistor, a DC voltage source, and an open switch are all connected to one another in series. After the switch is closed, which of one of the following statements is correct about this circuit combination?

No current still flows through the circuit once the capacitor is fully charged

Three capacitors are connected as shown in the figure. What is the equivalent capacitance between points A and B?

2.67 × 10^-6 F

If a proton is to orbit Earth at the equator by using Earth’s magnetic field to supply part of the necessary centripetal force, then in what direction should the proton ,one to accomplish this?

Eastward

Two, long straight wires are placed parallel to one another on a horizontal table and carry current in opposite directions. The current in one wire is 8.00 A and the current in the other wire is 16.0A. IF the magnetic force on the 8.00 A wire has a magnitude of F, what is the magnitude of the magnetic force on the 16.0 A wire? (Note: No external magnetic fields are present)

F

An external magnetic field exists in a region of space. A ferromagnetic material is placed into the region of space. As a result, the net magnetic field of its magnetic domains will become

Larger

A long, straight wire has a current of I flowing through it to the right and is positioned directly below a negatively charged particle -Q that is moving t the right with a speed of c as shown in the figure. In which direction is the magnetic force exerted on the particle due to the current?

Upward

A conducting wire that is 2.0m in total length is fashioned into a square loop and placed flat in the horizontal xy-plane. A uniform magnetic field is direction 60° above the horizontal plane, and has a magnitude of 5.1T. What is the magnetic flux through this loop?

1.1 Tm²

If the primary coil of a transformer uses 4.20 W of power while the secondary coil of the same transformer uses 4.00 W of power, then what is the percent efficiency of this transformer?

95.2%

An changing electric field is produced by a

Changing magnetic field

The strength of both the electric and magnetic fields in the radiation field are found to decrease with distance as

1/r

An electromagnetic wave is radiated by a straight wire antenna that is oriented vertically, What should be the orientation of a straight wire receding antenna? It should be placed

Vertically

What is the wavelength of light waves if their frequency is 5.0 × 10¹⁴ Hz?

0.60 µm

If one doubles the tension in a violin string, the fundamental frequency of that string will increase by a factor of

1.4

A transverse wave propagates on a 2.0 m long string fixed at both ends, under a tension of 40,000N with a mass per unit length ratio of 1 kg/m. Which of the following is not a resonant frequency of this string?

25 Hz

The intensity of a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?

I/4

You double your distance from a sound source that is radiating equally in all directions. What happens to the sound level of the sound? It drops by a value of

6 dB

Pressure and displacement for standing waves are

90° out of phase

Professor Weiler is tuning his guitar. As the two strings become closer to being in tune (nearing the same frequency), the beats heard from the interference pattern of the two tones

Decreases in frequency