Textbook QuestionA student wants to make a very small particle accelerator using a 9.0 V battery. What speed will (b) an electron have after being accelerated from rest through the 9.0 V potential difference?262views
Textbook QuestionA 3.0-cm-diameter parallel-plate capacitor has a 2.0 mm spacing. The electric field strength inside the capacitor is 1.0×10^5 V/m. a. What is the potential difference across the capacitor?498views
Textbook QuestionA 3.0-cm-diameter parallel-plate capacitor has a 2.0 mm spacing. The electric field strength inside the capacitor is 1.0×10^5 V/m. b. How much charge is on each plate?281views
Textbook QuestionTwo 2.00 cm×2.00 cm plates that form a parallel-plate capacitor are charged to ±0.708 nC. What are the electric field strength inside and the potential difference across the capacitor if the spacing between the plates is (a) 1.00 mm and316views
Textbook QuestionTwo 2.0-cm-diameter disks spaced 2.0 mm apart form a parallel-plate capacitor. The electric field between the disks is 5.0×10^5 V/m. b. An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.0×10^7 m/s. What was the electron's speed as it left the negative plate?665views
Textbook QuestionWhat is the escape speed of an electron launched from the surface of a 1.0-cm-diameter glass sphere that has been charged to 10 nC?143views
Textbook QuestionTwo 10-cm-diameter electrodes 0.50 cm apart form a parallel-plate capacitor. The electrodes are attached by metal wires to the terminals of a 15 V battery. After a long time, the capacitor is disconnected from the battery but is not discharged. What are the charge on each electrode, the electric field strength inside the capacitor, and the potential difference between the electrodes c. After the original electrodes (not the modified electrodes of part b) are expanded until they are 20 cm in diameter?347views
Textbook QuestionTwo small charged spheres are 5.0 cm apart. One is charged to +25 nC, the other to −15 nC. A proton is released from rest halfway between the spheres. What is the proton's speed after it has moved 1.0 cm?567views
Textbook QuestionFour small spheres, each charged to +15 nC, form a square 2.0 cm on each side. From far away, a proton is shot toward the square along a line perpendicular to the square and passing through its center. What minimum initial speed does the proton need to pass through the square of charges?484views
Textbook QuestionThe two halves of the rod in FIGURE EX25.35 are uniformly charged to ±Q. What is the electric potential at the point indicated by the dot?279views
Textbook QuestionTwo small metal cubes with masses 2.0 g and 4.0 g are tied together by a 5.0-cm-long massless string and are at rest on a frictionless surface. Each is charged to +2.0 μC. b. What is the tension in the string?315views
Textbook QuestionThe four 1.0 g spheres shown in FIGURE P25.42 are released simultaneously and allowed to move away from each other. What is the speed of each sphere when they are very far apart?598views1rank
Textbook QuestionA proton's speed as it passes point 1 is 50,000 m/s. It follows the trajectory shown in FIGURE P25.43. What is the proton's speed at point 2?405views
Textbook QuestionLiving cells 'pump' singly ionized sodium ions, Na+, from the inside of the cell to the outside to maintain a membrane potential ΔVₘₑₘbᵣₐₙₑ=Vᵢₙ−Vₒᵤₜ=−70 mV. It is called pumping because work must be done to move a positive ion from the negative inside of the cell to the positive outside, and it must go on continuously because sodium ions 'leak' back through the cell wall by diffusion. b. At rest, the human body uses energy at the rate of approximately 100 W to maintain basic metabolic functions. It has been estimated that 20% of this energy is used to operate the sodium pumps of the body. Estimate—to one significant figure—the number of sodium ions pumped per second.388views
Textbook QuestionAn arrangement of source charges produces the electric potential V=5000x^2 along the x-axis, where V is in volts and x is in meters. What is the maximum speed of a 1.0 g, 10 nC charged particle that moves in this potential with turning points at ±8.0 cm?341views
Textbook QuestionTwo 2.0-mm-diameter beads, C and D, are 10 mm apart, measured between their centers. Bead C has mass 1.0 g and charge 2.0 nC. Bead D has mass 2.0 g and charge −1.0 nC . If the beads are released from rest, what are the speeds vc and vD at the instant the beads collide?52views
Textbook QuestionThe electric potential in a region of space is given by V=V₀[(x²+2y²)/(0.10 m)²], where V₀ is a constant. A proton released from rest at (x, y)=(20 cm, 0 cm) reaches the origin with a speed of 7.5×10^5 m/s . b. At what value of y on the y-axis should a He+ ion (charge +e, mass 4 u) be released from rest to reach the origin with the same speed?191views
Textbook QuestionINT CALC Two positive point charges q are located on the y-axis at y = ±a. e. Your answer to part d shows that an electron experiences a linear restoring force, so it will undergo simple harmonic motion. What is the oscillation frequency in GHz for an electron moving between two 1.0 nC charges separated by 2.0 mm?228views
Textbook Question(III) During an action potential, Na⁺ ions move into the cell at a rate of about 3 x 10⁻⁷ mol/m² • s. How much power must be produced by the “active Na⁺ pumping” system to produce this flow against a +30-mV potential difference? Assume that the axon is 10 cm long and 20 μm in diameter.104views
Textbook QuestionCALC The electric potential along the x-axis is V = 100x^2 V, where x is in meters. What is Ex at (a) x=0 m and (b) x=1 m?99views
Multiple ChoiceA -2C charge lies at rest. (a) What is the potential difference between point A, which is 1.5m from the charge, and point B, which is 4m from the charge? (b) What would the work on a 4C charge be to move it from A to B?744views8rank7comments
Multiple ChoiceThe x component of a uniform electric field is Ex=12V/m. What is the potential difference between xi=45m and xf=12m?276views
Multiple ChoiceThe electric potential in a region of uniform electric field is 1200V at x=−4.3m and 2800V at x=2.1m. What is Ex?404views
Multiple ChoicePoint A is at −25V and point B is at 400V. A proton moves past point A at 3.5×105m/s, what is its speed when it reaches point B?301views
Multiple ChoiceThe water molecule is a permanent electric dipole with a dipole moment of 6.2×10−30Cm. A water molecule is aligned with an electric field of magnitude 7600V/m. How much energy is required to rotate the molecule 180°?656views