A copper wire of radius 0.1 mm and resistance `1 k Omega` is connected across a power supply of 20 V. (i) How many electrons are transferred per second between the supply and the wire at one end ? (ii) Write down the current density in the wire.

A copper wire of radius 0.1mm and resistance 1k(Omega) is connected across a power supply of 20 V.(a)How man electorns are transferred per second between the supply and the wire at one end?(b) Write down the current density in the wire.

A thin copper rod of radius 1mm having an electrical resistance of 100 Omega is connected to battery of emf 12 volts and negligible internal resistance through a wire of negligible resistance. Calculate current density in the wire. Also , calculate the number of electrons entering one and of the rod per seconds.

A conducting wire carrying 1 A of current is connected across a battery of 2V. Find the number of electrons flowing through the wire per second.

How many electrons per second pass through a section of wire carrying a current of 0.7A ?

A wire of length 1 m and radius 0.1mm gas a resistance of 100(Omega) .Find the resistivity of the material .

A metallic wire A of radius 1 mm is joined at one end with another metallic wire B of radius 2 mm . when a battery is connected between two free ends of this composite wire, a currents of 20 A flows through it. Calculate the currents density in wire A and also calculate the drift speed of electrons in wire B , if material of B has 9xx 10^(29) free electrons per unit volume.

A current of 1.0 ampere is flowing through a copper wire of length 0.1 metre and cross-section 1.0xx10^(-6) m^(2) . (i) If the specific resistance of copper be 1.7xx10^(-8) Omega m , calculate the potential difference across the ends of the wire. (ii) Determine current density in the wire. (iii) If there be one free electron per atom in copper, then determine the drift velocity of electrons. Given : density of copper =8.9xx10^(3) kg m^(-3) , atomic weight =63.5, N=6.02xx10^(26) per kg-atom.

A wire of resistance 16Omega is bent in to a circle and a cell of e.m.f. 2V and internal resistance 1Omega is connected between two points of wire, a quarter circumference apart. The current in each segment of wire is

A wire 8.00 m long and 6.00 mm in diameter has a resistance of 30.0 mOmega . A potential difference of 23.0 V is applied between the ends. (a) What is the current in the wire? (b) What is the magnitude of the current density? (c) Calculate the resistivity of the wire material.