A parallel plate capacitor is fully charged using a 12-V battery. If the plates

Question

A parallel plate capacitor is fully charged using a 12-V battery. If the plates of the capacitor has charge Q= 4 mu C, then the amount of work done by batters is: 2.4 Times 10^-5 J 3.0 Times 10^-5 J 1.8 Times 10^-5 J 3.6 Times 10^-5 J The current drawn from an ideal 12-V battery when a 50 Ohm resistor is connected across its terminals is: 240 mA 2400 mA 24 mA 2.4 mA A charged particle travels undeflected through perpendicular electric and magnetic fields. The field strengths are E=3000 N/C and B=30 mT. The velocity of the charged particle is: 1.0 Times 10^5 m/s 2.0 Times 10^5 m/s 3.0 Times 10^5 m/s 4.0 Times 10^5 m/s Both object distance and image distance measured in an experiment with con lens are 20 cm. The focal length of the lens is: 5 cm 10 cm 15 cm 20 cm

Explanation / Answer

MC1

W = q del V = 4 * 10^-6 ( 12) = 4.8 * 10^-5 J

MC2

I = V/R = 12/50 = 240 mA

MC3

E/B = v

v = 3000/ 30 * 10^-3 = 1.0 * 10^5 m/s

MC4

1/f = 1/p + 1/q

1/f = 1/20 + 1/20

f = 10 cm

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