A battery of emf E and internal resistance r is connected to a variable resistor R as shown in figure. Which one of the following is true ?

A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true

A battery of e mf 10 V and internal resistance 3Omega is connected to a resistor as shown in the figure. If the current in the circuit is 0.5 A . then the resistance of the resistor will be

.A cell of emf E and internal resistance r is connected across a variable resistor. Plot a graph showing variation of terminal voltage V of cell versus the current.

A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected across a variable resistance R . The value of R for which the power delivered in it is maximum is given by

A battery of emf E and internal resistance r is connected to a resistor of restance r_(1) and Q Joules of heat is produced in a certain time t . When te same battery is connected to another resistor of resistance r_(2) the same quantity of heat is produced in the same time t . Then the value of r is

A solenoid of inductance L with resistance r is connected in parallel to a resistance R . A battery of emf E and of negligible internal resistance is connected across the parallel combination as shown in the figure. At time t = 0 , switch S is opened, calculate (a) current through the solenoid after the switch is opened. (b) amount of heat generated in the solenoid.

If a battery of emf E and internal resistance r is connected across a load of resistance R . Shot that the rate at which energy is dissipated in R is maximum when R = r and this maximur power is P = E^2//4r .

A battery of emf 15 V and internal resistance of 4Omega is connected to a resistor. If the current in the circuit is 2A and the circuit is closed. Resistance of the resistor and terminal voltage of the battery will be

A 5V battery with internal resistance 2Omega and a 2V battery with internal resistance 1Omega are connected to a 10Omega resistor as shown in the figure. The current in the 10Omega resistor is