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Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or MEG, is used to study electrical activity in the brain using this concept. This technique is capable of detecting magnetic fields as weak as 1.0 ? 10-15 T. Model the neuron as a long wire carrying a current and find the current it must carry to produce a field of this magnitude at a distance of 4.8 cm from the neuron.
A step-down transformer (turns ratio = 1:8) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. What is the current in the primary coil
Suppose a mass of a certain spherical neutron star is twice the size of the sun and its radius is 10km. Determine the greatest possible angular speed the star can have so that the matter at its surface on the equator is just held in orbit by the grav..
In a purely inductive AC circuit, L=25.0 mH and the rms voltage is 150 V. Calculate the inductive reactance and the rms current in the circuit
A laser beam is traveling through an unknown substance. When it encounters a boundary with air, the angle of reflection is 27.9° and the angle of refraction is 39.0°. What is the speed of light in the substance
A ball of mass 0.120 kilogram is dropped from rest from a height of 1.25 meter. Determine what impulse was given to the ball by the floor
Draw a FBD for the falling coffee filter. What is the net force? What are we assuming by using the average velocity from Procedure 1 to estimate the height of the fall in Procedure 2?
Consider the H beta line of the Balmer series for hydrogen. Calculate the photon energy for this H beta line
A kicker punts a football from the very center of the field to the sideline 36 yards downfield. What is the direction of the net displacement of the ball
0.80 m and the mass of the particle the bob at the end of the cable is 0.24 kg. the pendulum is pulled away from its
An inventor claims that he has designed an engine which will produce a power output of 170kW while burning a unique fuel which releases 21,000kJ of heat in a minute. He states the upper and lower temperatures of the engine are 670K and 330K, respecti..
A 5.1cm x 3.8cm rectangle lies in the xz-plane. What is the electric flux through the rectangle if E = (100i^+40j^)N/C
An atom originally in an energy level with E = -8.85 eV absorbs a photon that has wavelength 738 nm. What is the internal energy of the atom after it absorbs the photon/
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