Figure Shows a diode connected to an external resistance and an e.m.f. Assuming that the barrier potential developed in diode is 0.5 V, obtain the value of current in the circuit in milliampere.

A cell of emf E and internal resistance r is connected to external resistance R_1 and R_2 and a perfect ammeter. The current in the circuit is measured in four different situations. without any external resistance in the circuit with resistance R _1 only with R_1 and R_2 in parallel combination with R_1 and R_2 in series combination the currents measured in the four cases are 0.42 A, 1.05A, 1.4A adn 4.2 A, but not necessarily in that order. Identify the currents corresponding to the four case mentioned above.

A resistor is connected to a battery of emf 10 V and internal resistance 0.3 Omega. What is the resistance of the resistor to be inserted in the circuit for the circuit current 1.2A?

A 10 V cell of negligible internal resistance is connected in parallel across a battery of emf 200 V and internal resistance 38 Omega as shown in the figure. Find the value of current in the circuit.

Show in figure two p-n junction diodes along-with a resistanc R and a d.c. battery E. Indicate the path and direction of flow of appreciable current in the circuit.

A 3 V battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I in the circuit will be

A circuit consists of a resistance 10 ohm and a capacitance 0.1muF . If an alternating e.m.f. of 100V, 50Hz is applied, calculate the current in the circuit.

Figure shows a series LCR circuit connected to a variable frequency 230 V source. L = 5.0 H, C = 80 muF , R= 40 Omega . Determine the rms potential drops across the three elements of the circuit. Show that the potential drop across the LC combination is zero at the resonating frequency. :

The circuit shown in the figure contains two diodes each with a forward resistance of 30 Omega and with infinite backward resistance. If the battery is 3 V, the current through the 100 Omega resistance (in ampere)