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Examveda

The value of $$\int\limits_C {\overrightarrow {\bf{A}} .d\overrightarrow {\bf{l}} } $$  along a square loop of side L in a uniform field $$\overrightarrow {\bf{A}} $$ is

A. zero

B. 2LA

C. 4LA

D. L2A

Answer: Option A


This Question Belongs to Engineering Physics >> Electromagnetic Theory

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Which one of the following current densities, $$\overrightarrow {\bf{J}} $$ can generate the magnetic vector potential $$\overrightarrow {\bf{A}} = \left( {{y^2}{\bf{\hat i}} + {x^2}{\bf{\hat j}}} \right)?$$

A. $$\frac{2}{{{\mu _0}}}\left( {x{\bf{\hat i}} + y{\bf{\hat j}}} \right)$$

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C. $$ - \frac{2}{{{\mu _0}}}\left( {{\bf{\hat i}} - {\bf{\hat j}}} \right)$$

D. $$\frac{2}{{{\mu _0}}}\left( {x{\bf{\hat i}} - y{\bf{\hat j}}} \right)$$