Questions in Current Electricity

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	Find out the value of current through 2? resistance for the given circuit
	Two batteries, one of emf 18 volts and internal resistance $2\Omega $ and the other of emf 12 volt and internal resistance $1\Omega $, are connected as shown. The voltmeter $V$ will record a reading of
	Two sources of equal emf are connected to an external resistance R. The internal resistances of the two sources are ${R_1}$ and ${R_2}\,({R_2} > {R_1})$. If the potential difference across the source having internal resistance ${R_2}$ is zero, then
	An energy source will supply a constant current into the load if its internal resistance is
	The magnitude of i in ampere unit is
	To draw maximum current from a combination of cells, how should the cells be grouped
	The figure shows a network of currents. The magnitude of currents is shown here. The current I will be
	The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of $3 \Omega$ resistance. If the total number of cells used are 24 and internal resistance of each cell is $0.5 \Omega$ then
	A cell of constant e.m.f. first connected to a resistance ${R_1}$ and then connected to a resistance ${R_2}$. If power delivered in both cases is then the internal resistance of the cell is
	In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistances are interchanged. The error so removed is