Two point charges ace 10 cm apart as shown. The electric field at point P is zer

Question

Two point charges ace 10 cm apart as shown. The electric field at point P is zero. How far is P from Q_1? The quantity of charge q(in coulombs) that passes through a surface of area 2.00 cm^2 varies with tine according to the equation q=36^-0, 5t sin (0.8t), where t is in seconds. What is the instantaneous current through the surface at t=0.8 s? A parallel plate capacitor is made of a pair of circular plates with diameter of 8 cm. They are separated by 1.8 mm of mica. The dielectric for mica is 4. If the charge on each plate has a magnitude of 362 mu C, how much energy is stored in the electric field between the plates? Rank in order, from brightest to dimmest, the identical bulbs A to E. What potential difference is needed to accelerate an electron from rest to a speed of 2.7 times 10^6 m/s?

Explanation / Answer

Suppose point P is at d distance then net electric field at point P

Ep = E1 - E2 = 0

E1 = E2

k*q1/r1^2 = k*q2/r2^2

r1 = d

r2 = 0.1 + d

35/d^2 = 45/(0.1 + d)^2

solving the equation

d = 0.7468 m = 74.68 cm

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