PHYS 5320 DPT2 Physics: Electricity and Magnetism

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Free PHYS 5320 DPT2 Physics: Electricity and Magnetism Questions

1.

Four solenoids have the same number of loops. Which solenoid would produce the strongest magnetic field?

  • the solenoid with 1 A of current

  • the solenoid with 10 A of current

  • the solenoid with 100 A of current

  • the solenoid with 0.1 A of current

Explanation

Explanation:

The magnetic field inside a solenoid is B = μ0nI, where n is the turn density and I is the current. With the same number of loops (and thus same nn), the field is directly proportional to the current. The solenoid carrying the greatest current, 100 A, will therefore produce the strongest magnetic field.

Correct Answer:

the solenoid with 100 A of current


2.

The direction of polarization of an electromagnetic wave is taken by convention to be:

  • the electric field direction.

  • the magnetic field direction.

  • the direction of E × B.

  • perpendicular to the electric field direction.

  • None of these choices are correct.

Explanation

Explanation:

By definition, the polarization of an electromagnetic wave is described by the orientation of its electric field vector. While the wave travels in the direction of E × B and the magnetic field is always perpendicular to the electric field, the term “polarization” specifically refers to the electric field’s direction.

Correct Answer:

the electric field direction.


3.

When the frequency of the voltage applied to a series RL circuit is increased, the phase angle _______.

  • does not change

  • cannot be determined without values

  • decreases

  • increases

Explanation

Explanation:

In a series RL circuit, the phase angle θ between the applied voltage and the current is given by θ = arctan(ωL/R), where ω = 2πf. As the frequency f increases, the inductive reactance ωL grows, making the ratio ωL/R larger. Because arctan of a larger number is a larger angle, the phase angle increases with increasing frequency.

Correct Answer:

increases


4.

An electric current in a conducting wire is proportional to:

  • The drift speed of the conducting electrons.

  • The cross-sectional area of the wire.

  • The number density (or concentration) of the conducting electrons.

  • All the above

Explanation

Explanation:

The current II in a conductor is given by I=nqvdAI = nqv_d A, where nn is the number density of electrons, qq is the charge of each electron, vdv_d is the drift speed, and AA is the cross-sectional area. This shows current is directly proportional to drift speed, cross-sectional area, and electron density.

Correct Answer:

All the above


5.

What is the relationship between the energy stored in an inductor and the inductance value, L, when a current I flows through it?

  • Inversely proportional to L

  • Directly proportional to L

  • Independent of L

  • Directly proportional to L2

Explanation

Explanation:

The energy stored in an inductor is given by U = 12 LI2. This shows that for a fixed current I, the stored energy is directly proportional to the inductance L. Increasing L increases the energy stored linearly, while decreasing L reduces it proportionally.

Correct Answer:

Directly proportional to L


6.

What must occur to a charged particle in order for it to radiate energy in the form of electromagnetic waves?

  • moves at constant velocity

  • accelerates

  • remains stationary

  • changes its mass

Explanation

Explanation:

A charged particle radiates electromagnetic energy only when it accelerates, which includes changing its speed or direction. A particle moving at constant velocity does not radiate, as there is no changing electric or magnetic field to generate electromagnetic waves. Acceleration causes time-varying electric and magnetic fields, which propagate as electromagnetic radiation.

Correct Answer:

accelerates


7.

The person to discover superconductivity was ____________.

  • Einstein

  • K Onnes

  • Meissner

  • Josephson

Explanation

Explanation:

Superconductivity, the phenomenon of zero electrical resistance in certain materials at very low temperatures, was first discovered by Heike Kamerlingh Onnes in 1911. Onnes observed that mercury exhibited zero resistance when cooled below a critical temperature. This discovery laid the foundation for the study of superconducting materials and their applications.

Correct Answer:

K Onnes


8.

When three equal resistors are connected in parallel, the total resistance is ____________.

  • Equal to the resistance of each

  • Less than any one resistor

  • Greater than any one resistor

  • None of these

Explanation

Explanation:

For resistors in parallel, the total resistance Rtotal is given by 1/Rtotal = 1/R + 1/R + 1/R = 3/R, so R_total = R/3. Since R/3 is less than R, the total resistance of three equal resistors in parallel is always less than any individual resistor.

Correct Answer:

Less than any one resistor


9.

In a Young's double-slit experiment, if the wavelength of the light used is doubled while keeping the distance from the slits to the screen constant, how does the distance between adjacent bright fringes change?

  • It remains the same

  • It doubles

  • It halves

  • It quadruples

Explanation

Explanation:

The fringe spacing in Young’s experiment is Δy = λL/d, where λ is the wavelength, L is the distance to the screen, and d is the slit separation. With L and d constant, doubling λ doubles Δy.

Correct Answer:

It doubles


10.

Which of these is NOT true for an RLC circuit at resonance frequency?

  • the impedance equals the resistance

  • the phase angle is zero

  • the current is the highest it can be

  • the capacitive reactance is zero

Explanation

Explanation:

At resonance, the impedance is purely resistive and equals the resistance of the resistor. The phase angle between current and voltage is zero, and the current reaches a maximum because reactances cancel. However, the capacitive reactance is not zero; it equals the inductive reactance in magnitude but not zero in value.

Correct Answer:

the capacitive reactance is zero


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