Home
Class 12
PHYSICS
If the external resistance is equal to i...

If the external resistance is equal to internal resistance of a cell of emf E. The current across the circuit is

A

`E/r`

B

`r/E`

C

`r/(2E)`

D

`E/(2r)`

Text Solution

Verified by Experts

The correct Answer is:
D

`I = E/(R+r)`
Promotional Banner

Similar Questions

Explore conceptually related problems

An external resistance R is connected to a cell of internal resistance r. The current in the circuit is maximum when

A cell of e.m.f. 2 V and internal resistance 2Omega and an external resistance 18Omega forms closed circuit. The current through the circuit is

An element with emf epsilon and interval resistance r is connected across an external resistance R . The maximum power in external circuit is 9 W . The current flowing through the circuit in these conditions is 3 A . Then which of the following is // are correct ?

A cell of emf epsilon and internal resistance r gives a current of 0.5 A with an external resistance of 12 Omega and a current of 0.25 A with an external resistance of 25 Omega . Calculate (a) internal resistance of the cell and (b) emf of the cell.

A battery of emf E and internal resistance r is connected is to external resistance B The maximum point is the external circuit is 9W The current flowing in the circuit under the condition is 3A What is the value of E in volt ?

A battery is of emt E and internal resistance r . The value of external resistance R so that the power across eternal resistance is maximum :

In a circuit a cell with internal resistance r is connected to an external resistance R. The condition for the maximum current that drawn from the cell is

Four cell each of emf 2 V and internal resistance 1 ohm are connected n parallel with an external resistance of 6 ohm. The current in the external resistance is

Ten cells each of emf 1 V and internal resistance 1Omega are connected inseries. In this arrangement, polarity of two cells is reversed and the system is connected to an external resistance of 2Omega . Find the current in the circuit.