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A battery of e.m.f. E has an internal resistance 'r'. A variable resistance R is connected to the terminals of the battery. A current I is drawn from the battery. V is the terminal P.D. lf R alone is gradually reduced to zero, which of the following best describes I and V?
(A) I approaches E / r, V approaches E
(B) I approaches infinity, V approaches E
(C) I approaches zero, V approaches E
(D) I approaches E / r, V approaches zero
An aluminum wire with a cross-sectional area of 3.9 x 10^(-6) m^2 carries a current of 1.9 A. Find the drift speed of the electrons in the wire
An X-ray photon with a wavelength of 0.120 nm scatters off a free electron at rest. What is the kinetic energy of the scattered electron
A barge on the Ohio river is 35 ft wide and 200 ft long with walls which are 12 ft high. What is the mass of the coal the barge is carrying downriver
the potential in cylindrical coordinates is given as V(r,φ)= (100/r)sin(3φ). Find Where is the location of zero voltage? Find electric field intensity for all points.
A popular make of dental drill can operate at a speed of 42,500 rpm while producing a torque of 3.68 oz - in. What is the power output of this drill
A mass-less pan hangs from a spring that is suspended from the ceiling. When empty, the pan is 51 cm below the ceiling. What is the pan's distance from the ceiling
A plane touches down for a landing with a ground speed of 120 mi/h (53.7 m/s). The runway is 1000 m in length and the plane stops at the end of the runway after slowing down with constant acceleration. What is the plane's acceleration while stoppi..
Electric charge Q has been spread uniformly over a circular arc of radius R and central angle 40 degrees. What is the potential at point P, center of curvature of the arc.
A charged particle moves through a velocity selector at a constant speed in a straight line, Find the charge-to-mass ratio of the particle
A 0.2 kg ball is suspended from the ceiling with a massless string (L=2.3m). What was the initial angular displacement of the pendulum
The force has magnitude 5.4 N and is directed at a counterclockwise angle of 103° from the positive direction of the x axis. How much work is done by the force on the coin during the displacement
A small can is hanging from the ceiling. A rifle is aimed directly at the can, as the figure illustrates. At the instant the gun is fired, the can is released. Ignore air resistance and show that the bullet will always strike the can, regardless of t..
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