普通物理 CH22

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普通物理CH22練習題

Problem 1

During a hard sneeze, your eyes might shut for 0.50 s. If you are driving a car at 90 km/h during such a sneeze, how far does the car move during that time?

the distance=_____m
可嘗試次數(no. of submission)= 3

01

Problem 2

The figure(a) shows a plastic rod having a uniformly distributed charge \(-Q\) . The rod has been bent in a \(120^0\) circular arc of radius \(r\) . We place coordinate axes such that the axis of symmetry of the rod lies along the x axis and the origin is at the center of curvature P of the rod. In terms of \(Q\) and \(r\), what is the electric field \(\vec{E}\) due to the rod at point P?

the magnetude of the electric field=\(\frac{AQ}{4 \pi \epsilon_0 r^2}\), A=___
可嘗試次數(no. of submission)= 3

02

Problem 3

What is the magnitude of a point charge whose electric field 50 cm away has the magnitude 2.0 N/C? (01小題)

q=_____C
可嘗試次數(no. of submission)= 3

03

Problem 4

Two particles are attached to an x axis: particle 1 of charge \(-2.00*10^{-7}C\) at \(x=6.00cm\) and particle 2 of charge \(2.00*10^{-7}C\) at \(x=21.0cm\) . Midway between the particles, what is their net electric field in unit-vector notation? (01小題)

E=_____N/C
可嘗試次數(no. of submission)= 3

04

Problem 5

In the figure, the four particles form a square of edge length \(a=5cm\) and have charges \(q_1=+10nC\) , \(q_2=-20nC\) , \(q_3=+20nC\) , and \(q_4=-10nC\) . In unit-vector notation, what net electric field do the particles produce at the square’s center?

\(E_x\)=___(N/C)
可嘗試次數(no. of submission)= 3

05

\(E_y\)=___(N/C)
可嘗試次數(no. of submission)= 3

06

Problem 6

In the figure, the three particles are fixed in place and have charges \(q_1=q_2=+e\) and \(q_3=+2e\). Distance \(a=6 \mu m\). What are the magnitude of the net electric field at point P due to the particles?

the net electric field=___(N/C)
可嘗試次數(no. of submission)= 3

07

Problem 7

The figure shows two parallel nonconducting rings with their central axes along a common line. Ring 1 has uniform charge \(q1\) and radius \(R\); ring 2 has uniform charge \(q2\) and the same radius \(R\). The rings are separated by distance \(d=3R\) . The net electric field at point P on the common line, at distance \(R\) from ring 1, is zero. What is the ratio \(\frac{q_1}{q_2}\) ?

the ratio \(\frac{q_1}{q_2}\)=___
可嘗試次數(no. of submission)= 3

08

Problem 8

A thin nonconducting rod with a uniform distribution of positive charge Q is bent into a circle of radius R (the figure).The central perpendicular axis through the ring is a axis, with the origin at the center of the ring. What is the magnitude of the electric field due to the rod at (a) \(z=0\) and (b) \(z=\infty\) (c) In terms of R, at what positive value of is that magnitude maximum?(d) If \(R=2cm\) and \(Q=5 /mu C\) ,what is the maximum magnitude?

(a)E=______N/C
可嘗試次數(no. of submission)= 3

09

(b)E=______N/C
可嘗試次數(no. of submission)= 3

10

(c)Z=______R
可嘗試次數(no. of submission)= 3

11

(d)E=______N/C
可嘗試次數(no. of submission)= 3

12

Problem 9

Charge is uniformly distributed around a ring of radius \(R=4.6cm\) , and the resulting electric field magnitude is measured along the ring’s central axis (perpendicular to the plane of the ring).At what distance from the ring’s center is maximum?

z=______cm
可嘗試次數(no. of submission)= 3

13

Problem 10

The figure(a) shows a nonconducting rod with a uniformly distributed charge +Q . The rod forms a half-circle with radius R and produces an electric field of magnitude \(E_{arc}\) at its center of curvature P. If the arc is collapsed to a point at distance R from P (the figure(b)), by what factor is the magnitude of the electric field at P multiplied?

the factor=\(\frac{E_{particle}}{E_{arc}}\)=___
可嘗試次數(no. of submission)= 3

14

Problem 11

An electron is released from rest in a uniform electric field of magnitude \(2*10^4 N/C\) . Calculate the acceleration of the electron. (Ignore gravitation.) (01小題)

the acceleration=___\(m/s^2\)
可嘗試次數(no. of submission)= 3

15

Problem 12

A uniform electric field exists in a region between two oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, 2.0 cm away, in a time \(1.5*10^{-8} s\) . (a) What is the speed of the electron as it strikes the second plate? (b) What is the magnitude of the electric field E ? (02小題)

(a)the speed=___(m/s)
可嘗試次數(no. of submission)= 3

16

(b)the magnitude of the electric field E=___(N/C)
可嘗試次數(no. of submission)= 3

17

Problem 13

An electric dipole consisting of charges of magnitude \(1.50 nC\) separated by \(6.2{\mu}m\) is in an electric field of strength \(1100N/C\) . What are (a) the magnitude of the electric dipole moment and (b) the difference between the potential energies E for dipole orientations parallel and antiparallel to E ? (02小題)

(a)the magnitude of the electric dipole moment=?(C*m)
可嘗試次數(no. of submission)= 3

18

(b)___(J)
可嘗試次數(no. of submission)= 3

19

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