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1) Two parallel long wires carry the same current and repel each other with a force F.per unit length. If both these currents are doubled and wire separation tripled, the force per unit length becomes:
A. 2F/3B. 2F/4C. 2F/9D. 4F/9E. 6F
explain your answer.
2) Solenoids are used to generate uniform magnetic fields. There is a relation B=m0nI. Explain why the magnetic field B inside the solenoid is proportional to n?
3) In Ampere's law, the integration must be over:
A. Any surfaceB. Any closed surfaceC. Any pathD. Any closed pathE. any closed path that surrounds all the current producing the magnetic field.
A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 5.54 m/s relative to the ground. How fast is the train moving
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A 0.250 block moving vertically upward collides with a light vertical spring and compresses it 4.00 before coming to rest. If the spring constant is 53.0 , what was the initial speed of the block? (Ignore energy losses to sound and other factors d..
A uniform bar is 5.00 m long and weighs 975 N. A weight of 255 N is attached to one end while a weight of 375 N is attached 1.50 m from the other end. Find the tension in the cable
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A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.66 of the person's regular weight. Calculate the acceleration of the elevator
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The mass of a regulation tennis ball is 58.0 g (although it can vary slightly), and tests have shown that the ball is in contact with the tennis racket for 31.0 ms. what impulse did he exert on the ball
A horizontal block-spring system with the block on a frictionless surface has total mechanical energy E = 42.3 J and a maximum displacement from equilibrium of 0.259 m, Find the potential energy stored in the spring when x = 0.160 m
In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotati..
An electron of kinetic energy 1.58 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 33.0 cm. Find the circling frequency (in Hz)
The potential for a mass hanging from a spring is V(y)=ky^2/2+mgy, when y=0 corresponds to the position of the spring when nothing is hanging from it. Find the frequency of small oscillators around the equilibrium point.
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