# GATE 2015 EE – SET 2 – Question 3

GATE 2015 EE – SET 2 – Question 3,Answer Key & Full Solutions to GATE 2017 Questions Papers for All branches .Full Solutions to GATE 2017 Questions Papers

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Solution :

Stokes Theorem :

Let S be an oriented smooth surface that is bounded by a simple close boundary curve C with a positive orientation . Also, let $$\vec{F}$$ be a field vector ,

$$\oint _{c}$$ Fdr =$$\iint_{s}$$ curl F.ds

$$\oint _{c}$$ Fdr =$$\iint_{s}(\bigtriangledown * A )$$ .ds

$$\oint _{c}$$  Adl   = $$\iint_{s}$$(\bigtriangledown * A ) .ds

Gauss theorem :

The total electric flux through any closed surface surrounding a charge Q is equal to the net positive charge enclosed by that surface .

$$\iint$$ D.ds = $$\sum$$ Q
$$\oint \oint$$ D.ds = Q

Divergence theorem :

Let V be a region in space with boundary dv .Then the volume integral of  the divergence ($$\bigtriangledown$$ .F) over V and the surface integral of
F  over the boundary dv of v are related by

$$\int _{v}(\bigtriangledown .F)$$dv =$$\int _{dv}$$  F.da

$$\int \int \int (\bigtriangledown .A)$$ dv = $$\oint \oint$$A.ds

Cauchy’s Integral theorem :

If f(z) is analytic in some simple connected region R , then

$$\int f(z)$$ dz = 0

Analytic \Rightarrow  f(z) satisfies Cauchy Riemann equations

$$\frac{\partial u}{\partial x}$$= $$\frac{\partial v}{\partial y}$$

$$\frac{\partial u}{\partial y}$$= -$$\frac{\partial v}{\partial x}$$