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Eight wires cut the page perpendicularly...

Eight wires cut the page perpendicularly at the points show in figure. A wire labeled with the integer k `(k=1.2,…….8)` bears the current `ki_(0)`. For those with odd k, the current flows up out of the page, for those with even k it flows down into the page. The value of `ointvecB.dvecr` along the close path (as shown in the figure) in the direction indicated by the arrow is

A

`10mu_(0)i_(0)`

B

`-10mu_(0)i_(0)`

C

`-4mu_(0)i_(0)`

D

`4mu_(0)i_(0)`

Text Solution

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The correct Answer is:
B
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