A uniform wire of resistance `12Omega` is bent in the form of a square. A cell of `emf6V` having negligible innternal resistance connected across the diagonal of the square. The magnetic induction at its centre `(` in tesla `)`.

A uniform wire of resistance 24 Omega is bent in form of a regular hexagon ABCDEF . A cell of e.m.f. 4 volt having negligible internal resistance is connected across the side AB of the hexagon. The field at its centre will be

A uniform wire of resistance 18 Omega is bent in the form of a circle. The effective resistance across the points a and b is

A uniform wire of resistance 18 Omega is bent in the form of a circle. The effective resistance across the points a and b is

A uniform wire of resistance 36 Omega is bent in the form of a circle. The effective resistance across the points A and B is

A uniform wire of resistance 36 Omega is bent in the form of a circle. The effective resistance across the points A and B is

A uniform wire of resistance 9 Omega is cut into 3 equal parts. They are connected in form of equilateral triangle ABC . A cell of e.m.f. 2V and negligible internal resistance is connected across B and C . Potential difference across AB is

A uniform wire of resistance 9 Omega is cut into 3 equal parts. They are connected in form of equilateral triangle ABC . A cell of e.m.f. 2V and negligible internal resistance is connected across B and C . Potential difference across AB is

A uniform wire of resistance 36Omega is bent in the form of a circle. The Effective resistance between A and B is (O is the centre of circle):

A uniform wire of resistance 36Omega is bent in the form of a circle. The Effective resistance between A and B is (O is the centre of circle):