What is the electron drift speed at the 3 mm diameter end (the left end) of the wire in figure.

Figure a) shows a spring of force constant k clamped rigidly at once end and a mass m attached to its free end. A force F applied at the free end stretches the spring. Figure b) shows the same spring with both ends free and attached to a mass m at either end. Each end of the spring in figure is stretched by the same force F. (a) What is the maximum extension of the spring in the two cases ? (b) If the mass in figure and the two masses in figure are released free, what is the period of oscillation in each case?

Figure a) shows a spring of force constant k clamped rigidly at once end and a mass m attached to its free end. A force F applied at the free end stretches the spring. Figure b) shows the same spring with both ends free and attached to a mass m at either end. Each end of the spring in figure is stretched by the same force F. (a) What is the maximum extension of the spring in the two cases ? (b) If the mass in figure and the two masses in figure are released free, what is the period of oscillation in each case?

Two parallel wires A and B are fixed to a right support at the upper ends and are subjected to the same load at the lower ends. The lengths of the wire are in the ratio 4:5 and their radius are in the ratio 4:3 . The increase in length of the wire A is 1mm.Calculate the increase in length of the wire B.

The radius of a metallic sphere is 60 mm .It is melted and recast in to wire of diameter 0.8 mm .Find the length of the wire.

What is meant by drift speed of free electrons ?

Choose the correct alternative (a), (b), (c) or (d) for each of the questions given below : A copper and a steel wire having same length and diameter are joined end-to-end. When a force is applied at the end of the wire, the net length of the wire increases by 1 cm. The wires will have :

The drift speed of electrons in copper wire of diameter and length l is v . If the potential difference across the wire is doubled, then the new drift speed becomes

A copper wire bent in the shape of a semicircle of radius r translates in its plane with a constant velocity v. A uniform magnetic field B exists in the direction perpendicular to the plane of the wire. Find the emf induced between the ends of the wire if (a) the velocity is perpendicular ot the diameter joining free ends, (b) the velocity is parallel to this diameter.

A current of 1.34A exists in a copper wire of cross-section 1.0mm^(2) . Assuming eac copper atom contributes one free eectron. Calculate the drift speed of the free electrons in the wire. The density of copper is 8990 kg// m^(3) and atom ic mass=63.50.

A current of 1.0 A exists in a copper wore of cross-section 1.0mm^(2) . Assuming one free electron per atom calculate the drift speed of the free electrons in the wire. The density of copper is 9000kg m^(-3) .