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AP Physics 2 : AP Physics 2

Study concepts, example questions & explanations for AP Physics 2

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6 Diagnostic Tests 149 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #1 : Electric Force In An Electric Field

A test charge of -8nC is placed in an electric field of $<.003,.003,.005>\frac{N}{C}$ .

Determine the force on the charge.

Possible Answers:

None of these

$\overrightarrow{F}=<-2.4*10^{-11},-2.4*10^{-11}, 4.2*10^{-11}>N$

$\overrightarrow{F}=<-1.4*10^{-11},-6.4*10^{-11}, 4.4*10^{-11}>N$

$\overrightarrow{F}=<-7.4*10^{-11},7.7*10^{-11}, 1.9*10^{-11}>N$

$\overrightarrow{F}=<-2.2*10^{-11},-1.9*10^{-11}, 2.0*10^{-11}>N$

Correct answer:

$\overrightarrow{F}=<-2.4*10^{-11},-2.4*10^{-11}, 4.2*10^{-11}>N$

Explanation:

The definition of electric force on a charge in an electric field:

$\overrightarrow{F}=\overrightarrow{E}q$

Plug in values.

$\overrightarrow{F}=<.003,.003,.005>\frac{N}{C}*-8*10^{-9}C$

$\overrightarrow{F}=<-2.4*10^{-11},-2.4*10^{11}, 4.2*10^{-11}>N$

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Example Question #2 : Electric Force In An Electric Field

A test charge of 9nC is placed in an electric field of $<.008,.008,.009>\frac{N}{C}$ .

Determine the force on the charge.

Possible Answers:

$\overrightarrow{F}=<8.2*10^{-11},8.2*10^{-11}, 3.7*10^{-11}>N$

None of these

$\overrightarrow{F}=<7.2*10^{-11},7.2*10^{-11}, 8.1*10^{-11}>N$

$\overrightarrow{F}=<6.2*10^{-11},6.2*10^{-11}, 1.7*10^{-11}>N$

$\overrightarrow{F}=<5.5*10^{-11},5.510^{-11}, 4.5*10^{-11}>N$

Correct answer:

$\overrightarrow{F}=<7.2*10^{-11},7.2*10^{-11}, 8.1*10^{-11}>N$

Explanation:

The definition of electric force on a charge in an electric field:

$\overrightarrow{F}=\overrightarrow{E}q$

Plug in values.

$\overrightarrow{F}=<.008,.008,.009>\frac{N}{C}*9*10^{-9}C$

$\overrightarrow{F}=<7.2*10^{-11},7.2*10^{-11}, 8.1*10^{-11}>N$

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Example Question #11 : Electric Force In An Electric Field

Calculate the force experienced by a particle with charge of q=3e^+ in the presence of an electric field $\vec{E}=500\hat{y}\left( \frac{N}{C} \right)$

$e=1.602*10^{-19}C$

Possible Answers:

$-2.40\times 10^{-16}\hat{z}(N)$

$2.40\times 10^{-16}\hat{y}(N)$

$2.40\times 10^{-16}\hat{x}(N)$

$-2.40\times 10^{-16}\hat{y}(N)$

$2.40\times 10^{-16}(N)$

Correct answer:

$2.40\times 10^{-16}\hat{y}(N)$

Explanation:

The force $\vec{F}$ on a given charge in the presence of an electric field $\vec{E}$ is given below as:

$\vec{F}=q\vec{E}$

It is important to note that the force will be directed along the same direction as the electric field. Therefore, for our problem, we are able to write

$\vec{F}=\left(3e^+ \right )\left(500\hat{y} \right )\left(\frac{N}{C} \right )$

$\vec F=3\left(1.602 * 10^{-19}C \right )500 \hat{y} \frac{N}{C}=2.40 \times 10^{-16}\hat{y}(N)$

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Example Question #12 : Electric Force In An Electric Field

A test charge of $6\mu C$ is placed in an electric field of $<.005,.005,.003>\frac{N}{C}$ . Determine the force on the charge.

Possible Answers:

$\overrightarrow{F}=<6*10^{-8},4*10^{-8}, 7.8*10^{-8}>N$

$\overrightarrow{F}=<9*10^{-8},9*10^{-8}, 1.8*10^{-8}>N$

None of these

$\overrightarrow{F}=<3*10^{-8},3*10^{-8}, 1.8*10^{-8}>N$

$\overrightarrow{F}=<3*10^{-8},3*10^{-8}, 4*10^{-8}>N$

Correct answer:

$\overrightarrow{F}=<3*10^{-8},3*10^{-8}, 1.8*10^{-8}>N$

Explanation:

The definition of electric force on a charge in an electric field is:

$\overrightarrow{F}=\overrightarrow{E}q$

$\overrightarrow{F}=<.005,.005,.003>\frac{N}{C}*(6*10^{-6}C)$

$\overrightarrow{F}=<3*10^{-8},3*10^{-8}, 1.8*10^{-8}>N$

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Example Question #91 : Electricity And Magnetism

A test charge of -9nC is placed in an electric field of $<-.008,-.008,.003>\frac{N}{C}$ . Determine the force on the charge.

Possible Answers:

$\overrightarrow{F}=<7.2*10^{-11},7.2*10^{-11}, -2.7*10^{-11}>N$

$\overrightarrow{F}=<7.2*10^{-11},4.5*10^{-11}, 4.5*10^{-11}>N$

None of these

$\overrightarrow{F}=<-7.2*10^{-11},-7.2*10^{-11}, 2.7*10^{-11}>N$

$\overrightarrow{F}=<6.9*10^{-11},7.2*10^{-11}, 3.8*10^{-11}>N$

Correct answer:

$\overrightarrow{F}=<-7.2*10^{-11},-7.2*10^{-11}, 2.7*10^{-11}>N$

Explanation:

The definition of electric force on a charge in an electric field is:

$\overrightarrow{F}=\overrightarrow{E}q$

$\overrightarrow{F}=<-.008,-.008,.003>\frac{N}{C}*(9*10^{-9}C)$

$\overrightarrow{F}=<-7.2*10^{-11},-7.2*10^{-11}, 2.7*10^{-11}>N$

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Example Question #41 : Electrostatics

A test charge of 35nC is placed in an electric field of $<.007,.006,.019>\frac{N}{C}$ . Determine the force on the charge.

Possible Answers:

$\overrightarrow{F}=<6.77*10^{-10},2.3*10^{-10}, 8.7*10^{-10}>N$

$\overrightarrow{F}=<3.11*10^{-10},5.25*10^{-10}, 3.11*10^{-10}>N$

$\overrightarrow{F}=<2.10*10^{-10},1.38*10^{-10}, 9.87*10^{-10}>N$

None of these

$\overrightarrow{F}=<2.45*10^{-10},2.1*10^{-10}, 6.65*10^{-10}>N$

Correct answer:

$\overrightarrow{F}=<2.45*10^{-10},2.1*10^{-10}, 6.65*10^{-10}>N$

Explanation:

The definition of electric force on a charge in an electric field is:

$\overrightarrow{F}=\overrightarrow{E}q$

$\overrightarrow{F}=<.007,.006,.019>\frac{N}{C}*(35*10^{-9}C)$

$\overrightarrow{F}=<2.45*10^{-10},2.1*10^{-10}, 6.65*10^{-10}>N$

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Example Question #14 : Electric Force In An Electric Field

Determine the force on a point charge of q=-33nC in an electric field of $<2.5,3.1>\frac{N}{C}$

Possible Answers:

$<7.77*10^{-9},1.02*10^{-7}>N$

$<8.25*10^{-9},1.02*10^{-7}>N$

$<-8.25*10^{-9},-1.02*10^{-7}>N$

None of these

$<-1.25*10^{-9},-8.02*10^{-7}>N$

Correct answer:

$<-8.25*10^{-9},-1.02*10^{-7}>N$

Explanation:

Use the following form of the electric force equation:

F_E=Eq

Plug in values:

$F_E=-33*10^{-9}*<2.5,3.1>\frac{N}{C}$

$F_E=<-8.25*10^{-9},-1.02*10^{-7}>N$

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Example Question #11 : Electric Force In An Electric Field

An object deep in space of mass 50mg and charge 60nC accelerates at $1.1\frac{m}{s^2}$ . Determine the electric field at this location.

Possible Answers:

$1.11*10^3\frac{N}{C}$

$3.86*10^2\frac{N}{C}$

$4.49*10^3\frac{N}{C}$

$9.17*10^2\frac{N}{C}$

$8.44*10^3\frac{N}{C}$

Correct answer:

$9.17*10^2\frac{N}{C}$

Explanation:

Use the following equation for electric force:

F_E=Eq

Plug in values:

$50*10^{-6}*1.1=60*10^{-9}*E$

$E=9.16*10^3\frac{N}{C}$

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Example Question #101 : Electricity And Magnetism

A $95\textup{ nC}$ charge of mass $55\ \mu\textup{g}$ accelerates with $<50,0>\ \frac{\textup{m}}{\textup{s}^2}$ . Determine the electric field.

Possible Answers:

$E=<48,0>\ \frac{\textup{N}}{\textup{C}}$

$E=<12,9>\ \frac{\textup{N}}{\textup{C}}$

$E=<15,15>\ \frac{\textup{N}}{\textup{C}}$

$E=<0,0>\ \frac{\textup{N}}{\textup{C}}$

$E=<28.9,0>\ \frac{\textup{N}}{\textup{C}}$

Correct answer:

$E=<28.9,0>\ \frac{\textup{N}}{\textup{C}}$

Explanation:

Using F_E=Eq and F=ma

Combining equations:

Eq=ma

Solving for

$\frac{m*a}{q}=E$

Converting $\mu g$ to , to and plugging in values

$\frac{55*10^{-9}*<50,0>}{95*10^{-9}}=E$

$E=<28.9,0>\frac{N}{C}$

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Example Question #741 : Ap Physics 2

An observer is away from a negatively charged sphere. How will the electric field change as they move closer to the sphere?

Possible Answers:

It will increase in magnitude and have constant direction

It will flip directions constantly

It will decrease in magnitude and have constant direction

None of these

It will increase in magnitude and flip directions

Correct answer:

It will increase in magnitude and have constant direction

Explanation:

E field negative

As one moves closer to a negative charge, the electric field increases in the direction of the negative charge.

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AP Physics 2 : AP Physics 2

Study concepts, example questions & explanations for AP Physics 2

All AP Physics 2 Resources

Example Questions

Example Question #1 : Electric Force In An Electric Field

Example Question #2 : Electric Force In An Electric Field

Example Question #11 : Electric Force In An Electric Field

Example Question #12 : Electric Force In An Electric Field

Example Question #91 : Electricity And Magnetism

Example Question #41 : Electrostatics

Example Question #14 : Electric Force In An Electric Field

Example Question #11 : Electric Force In An Electric Field

Example Question #101 : Electricity And Magnetism

Example Question #741 : Ap Physics 2

All AP Physics 2 Resources

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