What is the current in amperes in a wire
What is the current in amperes in a wire of radius R = 2.91 mm if the magnitude of the current density is given by (a) Ja =J0r/R and (b) Jb = J0(1 - r/R) in which r is the radial distance and J0 = 5.87 x 104 A/m2?
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Neglecting fringing, find (a) the potential difference (in V) between the plates, (b) the initial stored energy, (c) the final stored energy, and (d) the work required to separate the plates.
Suppose you discover a Type Ia supernova in a distant galaxy. At maximum brilliance, the supernova reaches an apparent magnitude of +10. How far away is the galaxy?
A diver 32 m deep in 8°C fresh water exhales a 1 cm diameter bubble. What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 25°C? Hint: Assume the air bubble is always in thermal equilibriu
A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of k
You discharge the capacitor through a 4.77-Ω resistor. What is the time constant? After what multiple of the time constant does the potential difference reach 2.47 V?
What is the maximum amount by which the wavelength of an incident photon could change when it undergoes Compton scattering from an atom or molecule with a 60.0 u mass? (1 u = 1.66 x 10-27 kg)."
A wire with a resistance of 7.1 Ω is drawn out through a die so that its new length is 3 times its original length. Find the resistance of the longer wire, assuming that the resistivity and density of the material are unchanged.
A spherical cavity of radius 4.50 cm is at the center of a metal sphere of radius 18.0cm. Determine the electric field at a point 6.0 cm from the center of the cavity.
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