## Answers

Magnetic field at point P due to two straight wire is zero because they pass through the point P. **(Subtends 0°).**

**Hence option a is false**

**Option B is also false** as in this case it is easy to find magnetic field using Biot sawart Law.

**Option C is true**

**Option D is false** as there is no magnetic field due to vertical section wire.

**Option E is alse false** as magnetic field at point P is not exactly zero because magnetic field due to 3/4 circle section is given by : 3o×I/8r where I is current and r is radius. i.e B≠0

**Option F is true** as magnetic field is calculated using Biot sawart law.

**Hence option C and F are true.**

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