A thin wire of length l=1m is shipped into a semicircle with diameter. Calculate the force per unit length at the mid-point of the diameter when it carries a current I = 8A.

A wire of length l and mass m is bent in the form of a semicircle. The gravitational field intensity at the centre of semicircle is

A thin rod of mass M and length L is bent into a semicircle as shown in diagram. What is a gravitational force on a particle with mass m at the centre of curvature?

When a potential difference of 2 V is applied across the ends of a wire of 5 m length, a current of 1 A is found to flow through it. Calculate (i) the resistance per unit length of the wire, (ii) the resistance of 2 m length of the wire. (iii) the resistance across the ends of the wire if it doubled on itself.

Two long parallel straight wires, each carrying a current of 2 A are placed at distance of 3 cm. Calculate the force acting per unit length of each wire. Also, state the nature of force between the wires if the currents flow in the same direction in both the wires.

A thin wire of length l and mass m is bent in the form of a semicircle as shown in the figure. Its moment of inertia about an axis joining its free ends will be

A straight wire of length L is bent into a semicircle. It is moved in a uniform magnetic field with speed v with diameter perpendicular to the field. The induced emf between the ends of the wire is

Two current carrying wire-1 and 2 infinitely long wires are kept parallel at a distance of 5 cm. Calculate the magnitude and direction of force per unit length on each wire if current of 6 A and 12 A flows in first and second wire respectively, in a similar direction.

A wheel of radius 8 units rolls along the diameter of a semicircle of radius 25 units; it bumps into this semicircle.What is the length of the portion of the diameter that cannot be touched by the wheel? 12 (b) 15 (c) 17 (d) 20