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The current density inside a long, solid, cylindrical wire of radius a is in the direction of the central axis and its magnitude varies with radial distance r from the axis according to J = br2, where b is a positive constant. Find the magnitude of the magnetic field as a function of distance r for (a) 0 ? r ? a and (b) r ? a. Express your answer in terms of the variables given and ?0.
A certain lightbulb is rated at 60.0 W when operating at an rms voltage of 120 V. What is the peak voltage applied across the bulb
A heater coil connected to a 240 Vrms ac line has a resistance of 34 Ohms. find min values of the instantaneous power
Two uniform infinite sheets of electric charge densities 48.0 C/m2, Find the magnitude of the electric field everywhere
Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next. What was your original speed
A circular loop of wire with a diameter of 0.626 m is rotated in a uniform electric field to a position where the electric flux through the loop is a maximum. At this position, an electric flux is 7.50 x 105 N×m2/C. find the magnitude of the elec..
A mass and spring are arranged on a horizontal, frictionless table. The spring constant is k = 560 N/m, and the mass is 4.35 kg. Find the velocity of the mass when it leaves the spring
A 80 kg man is ice-skating due north with a velocity of 6.0 m/s when he collides with a 35 kg child. find the magnitude of the child's velocity just before the collision
Two sinusoidal waves of the same period, with amplitudes of 7.3 and 7.60 mm, What is the phase constant of the 7.60 mm wave in rads
A 1.6 kg ball is at rest on the floor in a 2.4 m ? 2.4 m ? 2.4 m room of air at STP. Air is 80% nitrogen (N2) and 20% oxygen (O2) by volume. What is the thermal energy of the air in the room
Two astronauts, initially at rest in space, push on each other. what average force does each astronaut exert on the other
Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 40cm diameter Styrofoam sphere in water? Assume the volume of the mass is negligible compared to that of the sphere.
A 1500 ft2 wall has an R-value of 11.0 hr.oF.ft2/Btu, including the effects of the interior and exterior air layers. How many Btus are lost through this wall
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