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oblem 2 A vacuum-tube diode consists of two concentric cylindrical electrodes of opposite charge. The electric potential between the electrodes is given by V(x)Cxa where x is in meters and C is a constant. Let the distance between the electrodes equal 13.0 mm and their potential difference equal 240 V. (a) Calculate the value for C. 7.85x10 V/m3 (b) Derive and expression for the electric field between the electrodes as a function of x. [Answer not given.) (c) Determine the magnitude and direction of the force on an electron when it is halfway between the two electrodes. 3.13x10-15 N, toward the (+) electrode
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