A very long conducting wire is bent in a semi-circular shape from A to B as shown in figure. The magnetic field at point P for steady current configuration is given by

1. A. 0 i 4R pointed into the page
2. B. 0 i 4R pointed away from the page
3. C. 0 i 4R [1- 2 ] pointed away from page
4. D. 0 i 4R [1- 2 ] pointed into the page

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