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Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, divided into two sections (called hemispheres) each about 70mm wide. We can model the current in one hemisphere as a circular loop, 65mm in diameter, just inside the brain. The sensor is placed so that it is along the axis of the loop 2.30cm from the center. A reasonable magnetic field is 4.35fT at the sensor. According to this model, what is the current in the brain?
What is the magnetic field at the center of the hemisphere of the brain?
A piece of copper wire joins a piece of aluminum wire whose diameter is twice that of the copper. The same current flows in both wires, Compare the drift speeds in each
The 40 kg man in the roller coaster car is sitting on a bathroom scale. If he is travelling at 35.3 m/s at the point shown and the radius of vertical coaster track is 53 meters, to the nearest newton what does the scale read?
An airplane is flying in a horizontal circle at a speed of 100 m/s. The 80.0-kg pilot does not want her radial acceleration to exceed 7g. (a) What is the least radius of the circular path? (b) At this radius, what is the force causing the centripe..
at rest, a light source emits 532 nm light. as it moves along a line connecting it and Earth, observers on Earth measure the wavelength to be 412 nm. What is the sources velocity and direction? Were it to move in opposite direction at the same spe..
A person is making homemade ice cream. She exerts a force of magnitude 22 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handl..
What is the weight of the staging. A highway curve with radius 800 is to be banked so that a car traveling 56.0 will not skid sideways even in the absence of friction. At what angle must the curve be banked.
Two equal positive charges of magnitude q1 = q2 = 6 nC are on the y axis at y1 = +3 cm and y2 = -3 cm. (a) What is the magnitude and direction of the electric field on the x axis at x = 6 cm? b) What is the force exerted on a third charge q0 = 4 n..
A Hall probe serves to measure magnetic field strength. Such a probe consists of a poor conductor 0.165 mm thick, What is the magnetic field strength
If a car of mass 1000 kg is moving along a highway at 92 km/h, what is car's kinetic energy as determined by someone standing alongside the highway.
A person walks 36° north of east for 2.36 km. How far would another person walk due north and due east to arrive at the similar location.
The classroom temperature is 20 C. The relative humidity is 60%. What is the total humidity (kg of H2O vapor) in the room if its volume is 200 m3.
A roach that runs for its life because you try to hit it with your physics book runs off the horizontal tabletop with a speed of 0.685 m/s, What will be the vertical component of the roach's velocity just before it hits the floor
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