The charge on the positively charges plate is 6.0 times 10^-10 c. 2.4 times 10^-

Question

The charge on the positively charges plate is 6.0 times 10^-10 c. 2.4 times 10^-3 c. 1.5 times 10^-10 c. The electric field in the space between plates is 20 V/m 2.0 times 10^4 V/m 0.8 V/m Acopper wire of resistance 4.0 ohm and length 20 m connect a two terminals of a battery. The current through the wire is 0.3 A. (The battery has a negligible internal resistance.) The charge that passes through the cross section of the wire each second is 4.0 c. 0.6 v. 1.2 c. The emf of the battery is 1.2 v. 0.6 v. 8.0 v. The heat generated in the wire each second is 0.3 J. 1.2 J. 0.36 J. A copper wire of the same length with across sectional area two times as large has a resistance 2.0 ohm. 4.0 ohm. 8.0 ohm. The resistance of two resistance are 2.0 ohm and 3.0 ohm, respectively. They are connected in parallel. The equivalent resistance is 5.0 ohm. 1.2 ohm. 0.83 ohm. The relaxation time of an RC circuit, where c = 4.0 muF and R = 2.0 Mohm, is 8.0 s. 4.0 s. 0.5 s. 2.0 s.

Explanation / Answer

(6) i= 0.3 A

t= 1 sec

Q= i t = 0.3 (1) = 0.3 C

(7)  i= 0.3 A

R=4 ohm

V= i R = 0.3(4) = 1.2 volts

(8) heat = i^2 R t = 0.3^2 (4)(1)=0.36 j

(9) when area of crossection is doubled, reisistance will get get halved as R= rho L/a

so resistance=4/2 = 2 ohm

(10)1/r = 13+1/2

r= 1.2 ohm

(11) c= 4 x10^-6 F

R=2x10^6 ohm

time constant= R C=4 x10^-6 ( 2x10^6) = 8 seconds

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