A wire of cross-sectional area A forms three sides of a square and is free to rotate about axis OO'. If the structure is deflected by an angle `theta` from the vertical when current i is passed through it in a magnetic field B acting vertically upward and density of the wire is `rho`, then the value of `theta` is given by

Current I is flowing through a vertical long wire in the upward direction. The magnetic field at a point on the east of the wire is

A copper wire with cross-sectional area S = 2.5 mm^(2) bent to make three sides of a square can turn about a horizontal axis OO' (Fig). The wire is located in unifrom vertical magnetic field. Find the magnetic induction if on passing a current I = 16 A through the wire the latter deflects by an angle theta = 20^(@) .

A mettalic wire is bent into a square of each side a. If a current I is passed through the wire, what is the magnetic field at the centre of the square?

A copper wire with density rho with cross-sectional area S bent to make three sides of a squae frame which can turn about a horizontal axis OO' as shown in figure. The wire is located in uniform vertical magnetic field. Find the magnetic induction if on passing a current I through the wire the frame deflects by an angle theta in its equilibrium position.

A wire of length 'L' is bent in to an arc of a circle and found to subtentd and angle of 'theta' radians at the centre.If a current of 'I' is passed through it, the magnetic induction at the center of the circle is

What is the force on a wire if its length (L ) makes an angle 'theta' with the magnetic field (B) when the current passing in the wire is l?

As is the cross sectional area and rho is the specific resistance of a potentiometer wire. If I is the current passing through the potentiometer wire, then the potential gradient along the length of the wire is given by