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Consider an infinite straight wire with a current i. Derive asymbolic expression for the magnetic field at a distance r from thewire, by using either Ampere's law, Biot and Savart law, to showthat this magnetic field is given by B(r)=u0i/2pir
A movie camera with a (single) lens of focal length 90 mm takes a picture of a person standing 21 m away. If the person is 180 cm tall, what is the height of the image in millimeters
A square coil, enclosing an area with sides 3.4 cm long, is wrapped with 2,224 turns of wire. What average voltage is induced in the coil
A neighborhood transformer on the top of a utility pole transforms 15.0kV 60.0 Hz alternating voltage down to 120.0V to be used inside a house. how many turns does the primary coil have
The intake in the figure has cross-sectional area of 0.80 m2 and water flow at 0.41 m/s. What is the pressure difference between inlet and outlet
Aaron (mass 60 kg) catches his running cat (mass 5 kg) moving horizontally at 1.5 m/s. What is the speed of Aaron and his cat after the catch
1 kW radio transmitter operates at a frequency of 880kHz. How many photons per second does it emit
Two conducting wires of the same material are to have the same resistance. One wire is 17 m long and 0.39 mm in diameter. If the other wire is 0.31 mm in diameter, how long should it be?
in the produce section of a supermarket, five pears are placed on a spring scale. The placement of the pears stretches the spring and causes the dial to move from zero to a reading of 2.0kg. If the spring constant is 450 n/m, what is the displacement..
Big yellow fishing swimming at 2.0m/s swallows little green fish at rest. What fraction of big yellow fish's initial kinetic energy was lost is this collision
A point charge of 6.1 µC is at the center of a cubical Gaussian surface 60 cm on an edge. What is the net electric flux through the surface
A pair of speakers separated by 0.700m is driven by the same oscillator at a frequency of 662Hz. An observer, originally positioned at one of the speakers, begins to walk along a line perpendicular to line joining the speakers. (Assume the speed o..
A proton traveling to the right along the x-axis enters a region where there is a magnetic field of magnitude 3.7 T directed upward along the y-axis. The charge on a proton is 1.60×10?19. If the proton experiences a force of 3.6 × 10?12 N, find its s..
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