Current Electri...

If four resistances are connected as shown in the fig. between A and B, the effective resistance is:

Given circuit has $$n$$ cells attached to it. All the cells are identical. When one cell is reversed, the current decreases to $$0.7 A$$. The value of $$n$$ is 

The resistance of a conductor is 1.08$$\ \Omega $$. To reduce it to 1$$\ \Omega $$, the resistance that must be connected is:

The least resistance that one can have from six resistors each of 0.1 ohm resistance is:

A battery has six cells in series and each cell has an electromagnetic force $$1.5V$$ and internal resistance $$1 \Omega$$. If an external load of resistance $$24$$$$\Omega $$ is connected to it. The potential drop across the load is

The equivalent conductance of two wires of resistance 10 ohm and 5 ohm joined together in parallel is:

The resistance between A and B is:

Five cells of emf 1.5V and internal resistance 0.2 ohm are connected in series. The maximum current that can be delivered is

A potentiometer having a wire of $$4$$ $$m$$ length is connected to the terminals of a battery with a steady voltage. A leclanche cell has a null point at $$1$$ $$m$$. If the length of the potentiometer wire is increased by $$1$$ $$m$$, the position of the null point is

A potentiometer wire is $$10m$$ long and a potential difference of $$6V$$ is maintained between its ends. The emf of a cell which balances against a length of $$180 cm$$ of the potentiometer wire is: