4. (a) Define the electromotive force and explain the physical mechanism of the electromotive force source. (b) One circuit has constructed by electromotive force source which has ɛ = 5V and inner resistivity r = values of R1 powers dissipated in R1, R2 and r. 1N. Two serial connected resistances which have 5N placed in that circuit. Calculate the IN and R2

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it was an old question on exam, and I want know jow I can solve this question.

4. (a) Define the electromotive force and explain the physical mechanism of the
electromotive force source.
(b) One circuit has constructed by electromotive force source which has ɛ = 5V
and inner resistivity r = 12. Two serial connected resistances which have
values of R1
1N and R2
5N placed in that circuit. Calculate the
%3D
powers dissipated in R1, R2 and r.
• Gauss's law:
qin
€0
Here E is the electric field vector, da is the surface element vector, qin is the
total charge enclosed by the Gaussian surface, €o is the electric constant. The
integral is taken over the closed Gaussian surface.
• Electric potential at point P due to charge q is given by
V = k2.
1 q
4T€0 r
where r is the distance between the point P and the charge q. k = 9 x
10°NM2/C², eo
= 8.854 × 10-12C²/(Nm²).
• The power is defined by
P = VI = I²R= V² /R
Transcribed Image Text:4. (a) Define the electromotive force and explain the physical mechanism of the electromotive force source. (b) One circuit has constructed by electromotive force source which has ɛ = 5V and inner resistivity r = 12. Two serial connected resistances which have values of R1 1N and R2 5N placed in that circuit. Calculate the %3D powers dissipated in R1, R2 and r. • Gauss's law: qin €0 Here E is the electric field vector, da is the surface element vector, qin is the total charge enclosed by the Gaussian surface, €o is the electric constant. The integral is taken over the closed Gaussian surface. • Electric potential at point P due to charge q is given by V = k2. 1 q 4T€0 r where r is the distance between the point P and the charge q. k = 9 x 10°NM2/C², eo = 8.854 × 10-12C²/(Nm²). • The power is defined by P = VI = I²R= V² /R
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