Home
Class 12
PHYSICS
A conductor of length I is connected to ...

A conductor of length I is connected to d.c. source of potential v. if the length of the conductor is doubled by stretching it, keeping V constant, explain how do to following factors vary in the conductor Resistor

Text Solution

Verified by Experts

Resistor `R=rho*(l)/(A)`
Resistor becomes doubled i.e., 2 times the original resistors.
Promotional Banner

Similar Questions

Explore conceptually related problems

A conductor of length I is connected to d.c. source of potential v. if the length of the conductor is doubled by stretching it, keeping V constant, explain how do to following factors vary in the conductor Drift velocity.

The potential difference between two conductor is 110 V. How much work in moving 5 C charge from one conductor to the other ?

The potential difference between two conductors is 110 V. How much work is moving 10C charge from one conductor to the other?

A currrent I is passed through a silver strip of width d and area of cross section A. The number of free electrons per unit volume is n. (a) Find the drift velocity v of the electrons. (b) If a magnetic field B exists in the region as shown in what is the average magnetic force on the free electrons? (c) Due to the magnetic force, the free electrons get accumulated on one side of the conductor along its length. This produces a transverse electric field in the conductor which opposes the magnetic force on the electrons. Find the magnitude of the electric field which will be the potential diference developed across the width of the conductor due to the electron- accumulation? The appearance of a transverse emf, when a current-carrying wire is placed in a magnetic field, is called hall effect.

Consider a situation similar to that of the previous problem except that the ends of the rod slide on a pair of thick metallic rails laid parallel to the wire. At one end the rails are connected by resistor of resistance R. (a) what force is needed ot keep the rod sliding at a constant speed v? (b) in this situation what is the current in the resistance R? (c) Find the rate of heat developed in the resistor. (d) find the power delivered by the external agent exerting the force on the rod.

Two large conducting spheres carrying charges Q_1, and Q_2, are brought close to each other. Is the magnitude of electrostatic force between theme exactly given by (Q_1Q_2)/(4pi epsi_(0) r^(2)) , where r is the distance between their centres? b. If Coulomb's law involved 1/r^(3) dependence ("instead of "1/r^2), would Gauss law be still true? c. A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point? d. What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical? e. We know that electric field is discontinuous across the surface of a charged conductor. Is electric potential also discontinuous there? f. What meaning would you give to the capacitance of a single conductor? g. Guess a possible reason why water has a much greater dielectric constant (=80) than say, mica (= 6).