The unit of electric field is Newton, V/m, Tesla, F/m H/m Charge of 100 electron
ID: 1519495 • Letter: T
Question
The unit of electric field is Newton, V/m, Tesla, F/m H/m Charge of 100 electrons in nano Coulomb is -1.6 astir 10^10 nC -1.6 astir 10^-8 nC -1.6 astir 10^-9 nC -1.6 astir 10^10 nC Express the charge of 10 electrons in micro Coulomb? 1.6 astir 10^19 mu C -1.6 astir 10^-9 mu C -1.6 astir 10^-19 mu C -1.6 astir 10^-13 mu C -1.6 astir 10^-12 mu C A metal ball has -2.0 Coulomb of charge, If it receives 0.5 times 10^19 number of electrons, what -0.20 C, -2.8 C -18.0 C, -1.8 C 8.8 C A metal ball has + 2.1 Coulomb of charge, If 1.0 times 10^19 number of electrons are removed from the ball, what will be the resultant charge of the ball? -0.4 C, +3.7 C, +4.7 C +1.6C, -02CExplanation / Answer
1) b) V/m
2) b) charge = Q = ne = -100*1.6*10^-19 = -1.6*10^-8 nC
3) e) charge = Q = ne = -10*1.6*10^-19 = -1.6*10^-12 uC
4) b) Resultant charge = -2.0 - 0.5*10^19*1.6*10^-19 = -2.8 C
5) b) Resultant charge = +2.1 + 1.0*10^19*1.6*10^-19 = +3.7 C
6) c) Resultant force = F = sqrt[F1^2 + F2^2 + 2F1F2cos120] = 25 N
7) c) F’ = 9F as F = kq1q2/r^2
8) b) opposite to E as direction of E is +ve to –ve
9),10),11) other charge is not visible in image it is +ve or –ve.
12) d)F = kq^2/r^2 = 1 N ====> q = sqrt[r^2/k] = 0.01/sqrt[k]
13) b)E = kq/r^2 = k*1/(10^-4) = 10000k N/C
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