Question 1

A patient in a hospital receives an electric shock from a faulty piece of equipment. If the equipment applies a voltage of $$120\ \mathrm{V}$$ across the patient's body and the resistance of the body is $$1.5\ \mathrm{k\Omega}$$, what is the magnitude of the current passing through the patient?

Accepted Answer

$$0.08\ \mathrm{A}$$

Question 2

Which of the following best describes the relationship between electric field $$\vec{E}$$ and electric potential $$V$$?

Accepted Answer

The electric field is the gradient of the electric potential: $$\vec{E} = -
abla V$$

Question 3

A $$10\ \mu\mathrm{F}$$ capacitor is charged to $$100\ \mathrm{V}$$ and then disconnected from the battery. If the plates are pulled apart so that the capacitance decreases to $$5\ \mu\mathrm{F}$$, what is the new voltage across the capacitor?

Accepted Answer

$$200\ \mathrm{V}$$

Question 4

Which of the following statements about Ohm's Law is correct in the context of biological tissues?

Accepted Answer

Ohm's Law can be used to approximate current flow in biological tissues, but their resistance may change with conditions such as temperature or hydration.

Question 5

A defibrillator delivers a pulse of $$200\ \mathrm{J} of $$energy in $$2\ \mathrm{ms}. $$What is the average power output during the pulse?

Accepted Answer

$$100,000\ \mathrm{W}$$

Question 6

A wire carries a current of $$5\ \mathrm{A} in a $$region where the magnetic field is $$0.2\ \mathrm{T}. If $$the wire is $$0.5\ \mathrm{m}$$ long and oriented perpendicular to the field, what is the magnitude of the magnetic force on the wire?

Accepted Answer

$$1.0\ \mathrm{N}$$

Question 7

Which of the following best explains why MRI (Magnetic Resonance Imaging) machines require strong, uniform magnetic fields?

Accepted Answer

To align the nuclear spins of hydrogen atoms, which is necessary for producing detectable signals.

Question 8

A transformer in a hospital reduces the voltage from $$240\ \mathrm{V} to$$ $$12\ \mathrm{V} to $$power sensitive equipment. If the primary coil has $$600$$ turns, how many turns does the secondary coil have?

Accepted Answer

$$30$$

Question 9

Which of the following is a correct statement of Faraday's Law of Electromagnetic Induction?

Accepted Answer

The induced emf in a closed loop equals the negative rate of change of magnetic flux through the loop: $$\mathcal{E} = -\dfrac{d\Phi_B}{dt}$$

Question 10

A light ray passes from air ($$n=1.00) $$into water ($$n=1.33) at an $$angle of $$30^\circ to $$the normal. What is the angle of refraction in the water?

Accepted Answer

$$22.1^\circ$$

Question 11

Which of the following best describes the function of a capacitor in a defibrillator circuit?

Accepted Answer

It stores electrical energy and releases it rapidly to deliver a shock.

Question 12

A $$100\ \Omega$$ resistor and a $$200\ \Omega$$ resistor are connected in parallel across a $$12\ \mathrm{V}$$ battery. What is the total current supplied by the battery?

Accepted Answer

$$0.18\ \mathrm{A}$$

Question 13

Which of the following is NOT a consequence of Maxwell's equations?

Accepted Answer

A static magnetic field can produce a static electric field.

Question 14

A patient is exposed to a laser beam with an intensity of $$2.0 	imes 10^3$\ \mathrm{W/m^2$}$$ for $$0.5\ \mathrm{s}$$ over an area of $$1.0\ \mathrm{cm^2$}. $$How much energy is delivered to the tissue?

Accepted Answer

$$0.01\ \mathrm{J}$$

Question 15

Which of the following best explains why polarized sunglasses reduce glare?

Accepted Answer

They block horizontally polarized light reflected from surfaces.

Question 16

A double-slit experiment is performed with light of wavelength $$600\ \mathrm{nm}$$ and slit separation $$0.2\ \mathrm{mm}. If $$the screen is $$2.0\ \mathrm{m}$$ away, what is the distance between adjacent bright fringes?

Accepted Answer

$$6.0\ \mathrm{mm}$$

Question 17

Which of the following is a correct application of the ray model of light in the design of corrective lenses for nearsightedness (myopia)?

Accepted Answer

Concave lenses are used to diverge incoming light rays so that the image focuses on the retina.

Question 18

A $$9\ \mathrm{V}$$ battery is connected to a series circuit with a $$100\ \Omega$$ resistor and a $$10\ \mu\mathrm{F}$$ capacitor. How long does it take for the capacitor to reach approximately $$63\% of $$its maximum charge?

Accepted Answer

$$0.001\ \mathrm{s}$$

Question 19

Which of the following best describes the energy transformation in a photovoltaic solar cell?

Accepted Answer

Light energy is converted into electrical energy.

PHY203: General Physics III – Syllabus and Course Structure Overview

Guida di studio - Domande di pratica

Study guide - Flashcard