Current Electri...

In the circuit shown, the reading of ammeter when switch S is open and when switch S is closed respectively are

In the circuit as shown in figure the

Given figure shows a rectangular block with dimensions x, 2x and 4x. Electrical contacts can be made to the block between opposite pairs of faces (for example, between the faces labelled A-A, B-B and C-C). Between which two faces would the maximum electrical resistance be obtained (A-A : Top and bottom faces, B-B : Left and right faces, C-C : Front and rear faces)

A battery is connected to a uniform resistance wire AB and B is earthed. Which one of the graphs below shows how the current density J varies along AB?

A cylindrical metal wire of length l and cross sectional area S, has resistance R, conductance G,conductivity σ and resistivity ρ. Which one of the following expressions for σis valid?

A potential divider is used to give outputs of 4 V and 8 V from a 12 V source. Which combination of resistances,(R₁ : R₂ : R₃) gives the correct voltages ?

Find equivalent resistance between A and B

Following figure shows four situations in which positive and negative charges move horizontally through a region and gives the rate at which each charge moves. Rank the situations according to the effective current through the region greatest first

A and B are two square plates of same metal and same thickness but length of B is twice that of A. Ratio of resistances of A and B is

A moving coil galvanometer is converted into an ammeter reading upto 0.03 A by connecting a shunt of resistance 4r across it and into an ammeter reading upto 0.06 A when a shunt of resistance r is connected across it. What is the maximum current which can be sent through this galvanometer if no shunt is used?