Two parallel square metal plates that are 1.5 cm apart and 22 cm on each side carry equal but opposite charges uniformly spread out over their facing surfaces.
How many excess electrons are on the negative surface if the electric field between the plates has a magnitude of 18,000 N/C? (k = 1/40 = 9.0 109 N m2/C2, e = 1.6 10-19 C)
Question 2
The inductor in a radio receiver carries a current of amplitude 200 mA when a voltage of amplitude 2.40 V is across it at a frequency of 1400 kHz. What is the value of the inductance?
A) 1.43 H B) 4.42 H C) 1.97 H D) 1.36 H E) 9.20 H
Yinka Shonibare MBE, Nelson's Ship in a Bottle, Fourth Plinth, Trafalgar Square, London.
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