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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
Two crickets, Chirpy and Milada, jump from the top of a vertical cliff. Chirpy just drops and reaches the ground in 4.00s, How far from the base of the cliff will Milada hit the ground
A cube of iron, of side length 14cm, is heated from 10?C to 90?C; Calculate the total work done ON the cube and the change in internal energy of the cube
A converging lens with a focal length of 20 cm and a diverging lens with a focal length of -70 cm are 110 cm apart. Calculate the distance between image and diverging lens
A dentist's mirror is placed 2.3 cm from a tooth. The enlarged image is located 5.8 cm behind the mirror. How is the image oriented relative to the object
Police investigators, examining the scene of an accident involving two cars, measure 72 -long skid marks of one of the cars, Estimate the initial speed of the car assuming a level road
Let's build a helium atom. Start with a nucleus with 2 protons and 2 neutrons, Calculate the energy gained by the system constructing this atom
A small block with mass 0.0450kg slides in a vertical circle of radius 0.600m on the inside of a circular track. How much work was done on the block by friction during the motion of the block from point A to point B
Communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as the earth rotates. What is the period of a satellite in a geosynchronous orbit
Find the angular velocity of a centrifuge in which a particle 10 cm from the axis of rotation experiences a radial acceleration of 10^3 times g
You are driving to the grocery store at 20. You are 100 from an intersection when the traffic light turns red. Suppose that your reaction time is 0.70 and that your car brakes with constant acceleration. What acceleration would bring you to rest r..
A 100g wire is held under a tension of 250N with one end at x = 0 and other x = 10m. At time t = 0, pulse 1 is sent along the wire from the end at x = 10 m. At time t = 30 ms, pulse 2 is sent along the wire from the x = 0. At what position x do the..
Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. What is the voltage between the plates
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