Question 1

Two point particles, one with charge $$+8 	imes 10$$^{-9}$$ C and the other with charge -2$$ 	imes $$10^{-9} C$$, are separated by a distance of 4 m. What is the magnitude of the electric field in N/C midway between them?

Accepted Answer

$$22.5 N/C$$

Question 2

What is the electric potential in V midway between the two charges $$+8 	imes 10$$^{-9}$$ C and -2$$ 	imes $$10^{-9} C $$separated by 4 m?

Accepted Answer

$$27.0 V$$

Question 3

A housefly with a mass of $$12 mg $$and charge $$+73 pC is $$levitating above a charged surface. What is the magnitude of the electric field required to levitate the fly?

Accepted Answer

$$1.6 	imes 10$$^{6}$$ N/C

Question 4

In order for the housefly to hover, what must be the direction of the electric field?

Accepted Answer

Upward

Question 5

A particle of mass $$2.0 	imes 10$$^{-4}$$ kg and charge 5.0$ μC moves from point A (800 V) to point B (200 V), starting from rest. What is its speed at point B?

Accepted Answer

$$5.5 m/s$$

Question 6

The electric field at point 1 in the equipotential diagram points from high to low potential. If the potential difference between two equipotentials is $$25 V $$and the distance is $$0.01 m$$, what is the magnitude of the electric field?

Accepted Answer

$$2500 V/m$$

Question 7

In an ECG setup, if the heart’s electric dipole moment points toward the positive terminal, what will the voltmeter display?

Accepted Answer

A positive potential difference

Question 8

A circuit contains four identical light bulbs (A-D) and a switch. When the switch is open, how should the bulbs be ranked from brightest to dimmest?

Accepted Answer

A \u003e B = D \u003e C

Question 9

After the switch in the circuit closes, how should the bulbs be ranked from brightest to dimmest?

Accepted Answer

A \u003e B = C = D

Question 10

What is the total resistance of the circuit with resistors $$2.0 \Omega$$, $$6.0 \Omega$$, $$8.0 \Omega$$, $$8.0 \Omega$$, and $$4.0 \Omega$$ arranged as shown in the exam?

Accepted Answer

$$10 \Omega$$

Question 11

If the battery voltage is $$12 V $$and the total resistance is $$10 \Omega$$, what is the current through the battery?

Accepted Answer

$$1.2 A$$

Question 12

Which equation correctly relates the electric field $$E to $$the change in electric potential $$\Delta V$$ and distance $$\Delta s$$?

Accepted Answer

$$E = \frac{\Delta V}{\Delta s}$$

Question 13

A fly accumulates a positive charge and hovers above a surface. Which force diagram best represents the forces acting on the fly?

Accepted Answer

Upward electric force and downward gravitational force

Question 14

If a circuit contains a battery and resistors in both series and parallel, which formula should be used to calculate the equivalent resistance for the parallel section?

Accepted Answer

$$R_{eq} = \left( \frac{1}{R_1$} + \frac{1}{R_2$} + \frac{1}{R_3$} \$$right)^{-1}$$

Question 15

A patient is connected to an ECG with the positive terminal at point 1 and the negative terminal at point 3. If the heart’s dipole moment points toward point 1, what is the sign of the measured potential difference?

Accepted Answer

Positive

Question 16

If the electric potential graph decreases linearly with position $$x$$, what is the electric field in that region?

Accepted Answer

Constant and negative

Question 17

A circuit contains a battery and several resistors. If the battery voltage is $$V$$ and the total resistance is $$R_{eq}$$, what is the formula for the current through the battery?

Accepted Answer

$$I = \frac{V}{R_{eq}}$$

Question 18

Which of the following best describes why musicians are at risk of electrocution during thunderstorms, as referenced in the comic?

Accepted Answer

Musicians and their equipment can act as conductors, allowing electric current to flow through them if struck by lightning.

Question 19

If a charged particle moves from a region of higher electric potential to lower electric potential, what happens to its kinetic energy?

Accepted Answer

It increases

Physics 202 Exam 2 – Step-by-Step Study Guidance

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드