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**1. An electric circuit consists of two long straight sections connecting a loop of radius r. The gap in the loop where the straight sections are connected subtends an angle of theta=60d, as shown in this figure (http://imgur.com/tseDHL6). Determine the magnetic field B at the point P in the centre of the loop, if a current I is flowing through the circuit.**

See the diagram here - http://imgur.com/tseDHL6

**2. Biot-Savart Law**

**3. The Attempt at a Solution - http://imgur.com/QFrlSn7**

I have found the equation relating to the full loop but don't know how to do it for the missing segment.