Concept explainers
This afternoon, you have a physics symposium class, and you are the presenter. You will be presenting a topic to physics majors and faculty. You have been so busy that you have not had time to prepare and you don’t even have an idea for a topic. You are frantically reading your physics textbook looking for an idea. In your reading, you have learned that the Earth carries a charge on its surface of about 105 C, which results in electric fields in the atmosphere. This gets you very excited about a new theory. Suppose the Moon also carries a charge on the order of 105 C, with the opposite sign! Maybe the orbit of the Moon around the Earth is due to electrical attraction between the Moon and the Earth! There’s an idea for your symposium presentation! You quickly jot down a few notes and run off to your symposium. While you are speaking, you notice one of the professors doing some calculations on a scrap of paper. Uh-oh! He has just raised his hand with a question. Why are you embarrassed?
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Chapter 22 Solutions
Physics for Scientists and Engineers
- Flying insects such as bees may accumulate a small positive electric charge as they fly. In one experiment, the mean electric charge of 50 bees was measured to be ++(30 ±± 5) pCpC per bee. Researchers also observed the electrical properties of a plant consisting of a flower atop a long stem. The charge on the stem was measured as a positively charged bee approached, landed, and flew away. Plants are normally electrically neutral, so the measured net electric charge on the stem was zero when the bee was very far away. As the bee approached the flower, a small net positive charge was detected in the stem, even before the bee landed. Once the bee landed, the whole plant became positively charged, and this positive charge remained on the plant after the bee flew away. By creating artificial flowers with various charge values, experimenters found that bees can distinguish between charged and uncharged flowers and may use the positive electric charge left by a previous bee as a cue…arrow_forwardCalculate the electric field entry in row 3 of the following table. (The row numbers are at the edge of the row.) The magnitude of the electric field is |dV/dx|, approximated as a positive ΔV/Δx Voltage Level (Volts) Position (cm) 15.7 7 12.2 5.6 9.5 4.1 6.4 2.9 3.3 1.4 0.0 0 Electric Field (V/cm) Deviation (V/cm) 1 2 3 4 5 Average 6arrow_forwardA particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -2.3 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vz = 20 m/s, vx = vy = 0, what is the distance from the origin to the particle at t = 1.0 s?arrow_forward
- A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s? Select one: a. 60 m b. 28 m c. 88 m d. 12 m e. 56 marrow_forwardAn electron has an initial velocity of 2.4x106 m/s in the +x direction. It enters a uniform electric field E = 397 N/C which is in the +y direction. What is the ratio of the y-component of the velocity of the electron to the x-component of the velocity after traveling 5 cm in the +x direction in the field? (Your result must include 2 digit after the decimal point and maximum of 5% of error is accepted in your answer. Take elementary charge 1.6x10-19 C and take mass of electron 9.1x10-31 kg.)arrow_forwardX2. The magnitude of the electric field between the two circular parallel plates in figure below is E = (4.0x105) - (6.0x104 t), with E in volts per meter and t in seconds. At t = 0, E is upward. The plate area is 4.0x10-² m². For t≥ 0, what are the (a) magnitude and (b) direction (up or down) of the displacement current between the plates and (c) is the direction of the induced magnetic field clockwise or counter- clockwise in the figure?arrow_forward
- Two charges lie in a line along the x axis. Charge 1 is q1= 0.75C and charge 2 is q2= 2.35 C. They are each a distance of d=0.025m from the origin. What is the distance on the x- axis from the origin at which the electric field will be zero. Give answer in meters. I need a detailed explanation because I suck at physics . I get the quadratic part but afterwards I'm stuckarrow_forwardAn electron with an initial velocity of (3X105 m/s)j enters a region; in which the electric field is (250 N/C) ?. What is the speed of the electron in terms of 105 m/s at 2 nanoseconds after it enters the electric field region? electron mass = 9.1 X10-31 Kgarrow_forwardThe velocity of a particle (m = 10 mg, q = - 4.0 µC) at t = 0 is 20 m/s in the positive x-direction. If the particle moves in a uniform electric field of 20 N/C in the positive x-direction, what is the particle's velocity ( in m/s) at t = 16.3 s?arrow_forward
- Two charges lie in a line along the x axis. Charge 1 is q1= 0.75C and charge 2 is q2= 2.35 C. They are each a distance of d=0.025m from the origin. What is the distance on the x- axis from the origin at which the electric field will be zero. Give answer in meters.arrow_forwardA particle (q = 5 mC, m 5 mC, m = 20 g) has a speed of 13 m/s when it enters a region where the electric field has a constant magnitude of 43 N/C and a direction that is the same as the speed of the particle What is the particle's velocity 5 s after it enters this region? From your answer without a decimal place.arrow_forwardA futuristic gun uses a strong electric field to accelerate small charged bullets to very fast speeds. The specially made bullets have a mass of 0.01kg and a hold charge of 0.1C. If the gun accelerates the bullets over a distance of 0.6m to a speed of vf = 10*m/s, what must be the strength of the electric field inside the gun? Give your answer in scientific notation with 2 or 3 significant digits.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning