Field at a point due to a wire made of straight parts and arcs (figure)

1. A.
   $\frac{\mu_0}{4\pi}\frac{I}{r}\left(\frac{2}{\pi} + 2\right)$
2. B.
   $\frac{\mu_0}{4\pi}\frac{I}{r}\left(\frac{2}{\pi} - 2\right)$
3. C.
   $\frac{\mu_0}{4\pi}\frac{I}{r}\left(2 + \frac{\pi}{2}\right)$
4. D.
   $\frac{\mu_0}{4\pi}\frac{I}{r}\left(2 - \frac{\pi}{2}\right)$

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1. A.
   Zero
2. B.
   $\frac{\mu_0}{4\pi}\frac{2}{r}(1+\pi)$
3. C.
   $\frac{\mu_0}{4\pi}\frac{I}{r}(1+\pi)$
4. D.
   $\frac{\mu_0}{4\pi}\frac{2I}{r}(\pi-1)$

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1. A.
   $\frac{\mu_{0}I}{4R}$
2. B.
   $\frac{\mu_{0}I}{2R}$
3. C.
   $\frac{\mu_{0}I}{4\pi R}$
4. D.
   $\frac{\mu_{0}I}{2\pi R}$

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1. A.
   $\frac{\mu_{0}i}{4\pi r}\left( \frac{3\pi}{2} + 1 \right)( - \widehat{k})$
2. B.
   $\frac{\mu_{0}i}{4\pi r}\left( \frac{3\pi}{2} + 1 \right)\widehat{k}$
3. C.
   $\frac{\mu_{0}i}{4\pi r}\left\lbrack \frac{3\pi}{2} - 1 \right\rbrack( - \widehat{k})$
4. D.
   $\ \frac{\mu_{0}i}{4\pi r}\left\lbrack \frac{3\pi}{2} - 1 \right\rbrack\widehat{k}$

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1. A.
   $\frac{\mu_{0}I}{4\pi r} + \frac{\mu_{0}I}{r}$
2. B.
   $\frac{\mu_{0}I}{4\pi r} + \frac{\mu_{0}I}{2r}$
3. C.
   $\frac{\mu_{0}I}{4\pi r} + \frac{\mu_{0}I}{4r}$
4. D.
   $\frac{\mu_{0}I}{4\pi r} - \frac{\mu_{0}I}{4r}$

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1. A.
   zero
2. B.
   $\frac{\mu_{0}I}{4\pi r}(\pi - 1)$
3. C.
   $\frac{\mu_{0}I}{2\pi r}(\pi + 1)$
4. D.
   $\frac{\mu_{0}I}{2\pi r}(\pi - 1)$

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1. A.
   $\dfrac{\mu_0}{4\pi}\dfrac{I}{r}\left(\dfrac{2}{\pi} + 2\right)$
2. B.
   $\dfrac{\mu_0}{4\pi}\dfrac{I}{r}\left(\dfrac{2}{\pi} - 2\right)$
3. C.
   $\dfrac{\mu_0}{4\pi}\dfrac{I}{r}\left(2 + \dfrac{\pi}{2}\right)$
4. D.
   $\dfrac{\mu_0}{4\pi}\dfrac{I}{r}\left(2 - \dfrac{\pi}{2}\right)$

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