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The magnetic field B at the center of a circular coil of wire carrying a current I (as in fig. 20-9) is where N is the number of loops in the coild and r is its radius. suppose that an electromagnet uses a coild 1.2 m in diameter made from square copper wire 1.6 mm on a side. The power supply produces 120 V at a maximum power output of 4.0 kW.
a) How many turns are needed to run the power supply at maximum power?
b) What is the magnetic field strength at the center of the coil?
c) if you use a greater number of turns and this same power supply (so the voltage remains at 120V), will a greater magnetic field strength result? explain
A small earthquake starts a lamppost vibrating back and forth. find the time constant for the damping of the oscillation
A set of coupled pendula has m = 0:2kg for both masses, but k and l are unknown. At t = 0, the left hand mass is held at xL = 2:5cm and the right hand mass is held at xR = 0, Find the approximate values of k and l
A horizontal beam of vertically polarized light of intensity 43 W/m2 is sent through two polarizing sheets. What is the intensity of the light transmitted by the pair of sheets
A tire is filled with air at 15 oC to a gauge pressure of 220 kPa. If the tire reaches a temperature of 38 oC, How much energy do you need to boil off 2 kg block of ice
A 5m length of wire cariying a current of 5A lies on a hoizontal table with a rectangular top of dimensions 3.00m x 4.00m. What magnetic force acts on this segment of wire
the near point of a person's eye is 52.8 cm. To see objects clearly at a distance of 24.0 cm, what should be the focal length and power of the appropriate corrective lens
The loaded cab of an elevator has a mass of 1.7 x 103 kg and moves 239 m up the shaft in 19 s at constant speed. At what average rate does the force from the cable do work on the cab.
Waves travel at different velocity in different medium. How does wave velocity effect wave frequency
What should the charge (sign and magnitude) of a particle of mass 1.21 be for it to remain stationary when placed in a downward-directed electric field of magnitude 610.
A metallic sphere has a charge of +4.4 nC. A negatively charged rod has a charge of -6.0 nC. When the rod touches the sphere, 7.2 109 electrons are transferred. What are the charges of the sphere and the rod now? sphere nC rod nC
What additional experiment can help you decide between these two possibilities.
the velocity of an airplane is 50km/hr due north. the plane the plane flies into a cross wind of 50km/hr due east at a right angle
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