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Start from the expression of the electric filed outside an infinite sheet of uniform surface charge density, E = ?/2?, derive the electric field just outside an ideal conductor: E = ?/?. Do not use Gauss's law
You have two small 2.0- balls that have been given equal but opposite charges, but you don't know the magnitude of the charge. To find out, you place the balls a distance apart on a slippery horizontal surface, release them, and use a motion detec..
An electron is orbiting a proton under the Coulomb force in a hydrogen atom at a radius of 0.52 × 10-10 m
Light travels at about 0.75c in water. What's the wavelength in water of light whose wavelength in vacuum is 664nm
Two point charges are fixed on the y axis: a negative point charge q1 = -28 µC at y1 = +0.23 m and a positive point charge q2 at y2 = +0.31 m. A third point charge q = +8.7 µC is fixed at the origin. The net electrostatic force exerted on the char..
A skydiver reaches a "terminal velocity" of 120 km/h. If the skydiver has a mass of 59kg, what is the magnitude of the upward force on the skydiver
A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed, What is the magnitude of the tension in the string when the ball is at the bottom of the circle
A uniform plank of length 6m and weight 211N rests horizontally on two supports, with 1.1 m of the plank hanging over right support. To what distance x can a person who weighs 442N walk on the overhanging part of the plank before it just begins to..
A proton moves with a speed of 2.4 106 m/s horizontally, at the right angle to a magnetic field. What magnetic field strength is required to just balance the weight of the proton and keep it moving horizontally.
Two unequal point charges q1 and q2 are held in place unconnected from each other. A point charge Q is placed somewhere between them at a point where it remains stationary when free. From this observation, we can conclude that q1 and q2 must eithe..
An inductor (L = 400 mH), a capacitor (C = 4.43 F), and a resistor (R = 500 ?) are connected in series. A 50.0-Hz AC source produces a peak current of 250 mA in the circuit. (a) Calculate the required peak voltage Vmax. (b) Determine the phase ang..
A transformer has 350 primary turns and 1390 secondary turns. The input voltage is 120?V and the output current is 18.0A, find the output voltage and input current
A 2.40 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats.
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