Related InterviewSolutions

• A battery of emf 6V internal resistance 5`Omega` is joined in parallel with another cell of emf of 10V and internal resistance `1Omega` and the combination is used to send current through a resistor of `12Omega`. Calculate the current through each battery.
• A battery of emf 6 volts and internal resistance `1Omega` is connected in parallel to another battery of emf 8V and internal resistance `2Omega`. The combination is then used to send current through an external resistance of `10Omega`. Find the current through the external resistance.
• Calculate the the resistivity of the material of a wire whose resistance is `5Omega`, length 1m and radius 0.6mm.
• In a wheatstone bridge, the resistance of the arms of the bridge are AB = `2Omega`, BC = `4Omega` ,AD = `1Omega` and DC = `3Omega`. The terminals of negligible resistance to A and C. If a galvanometer of resistance `100Omega` is connected between B and D, find the current in the galvanometer.
• How you would arrange 24 cells, each of emf 1.5V and internal resistance `0.5Omega`, to deliver maximum current to a resistor of `4Omega`? What is the maximum current?
• A straight copper-wire of length `100m` and cross-sectional area `1.0mm^(2)` carries a current `4.5A`. Assuming that one free electron corresponds to each copper atom, find (a) The time it takes an electron to displace from one end of the wire to the other. (b) The sum of electrostatic forces acting on all free electrons in the given wire. Given resistivity of copper is `1.72xx10^(-8)Omega-m` and density of copper is `8.96g//cm^(3)`.
• Twelve identical resistor are arranged on all edges of a cube. Then find the equivalent resistance between the corners 1 and 6 as shown in fig 5.126(use nodal method) .
• A moving coil galvanometer of resistance `50Omega` is connected in series with a fixed resistance `50Omega` and the combination to a cell of steady emf and negligible internal resistance. What is the shunt required to halve the current through the galvanometer?
• Three wires whose lengths are in the ratio `3:8:18` and radii in the ratio `1:2:3` are connected in parallel. Find the ratio of the currents through them.
• A shunt is to be applied to a galvanometer of `99Omega` so that only 10% of the total current passes through it. Find the shunt required. What additional shunt will be required to send `1%` of the total current through the galvanometer?