Kirchhoff's second law is based on the law of conservation of

• Charge

• Energy

• Momentum

• Sum of mass and energy

The magnitude and direction of the current in the circuit shown will be

• 7/3 A from a to b through e

• 7/3 A from b to a through e

• 1A from b to a through e

• 1A from a to b through e

The e.m.f. of a cell is E volts and internal resistance is ohm. The resistance in external circuit is also r ohm. The p.d. across the cell will be

• E/2

• 2E

• 4E

• E/4

A cell whose e.m.f. is 2 V and internal resistance is  $0.1\Omega$  , is connected with a resistance of $3.9\Omega$  . The voltage across the cell terminal will be 

• 0.50 V

• 1.90 V

• 1.95 V

• 2.0 V

n identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The current through R is

• $\frac{nE}{R+nr}$

• $\frac{nE}{nR+r}$

• $\frac{E}{R+nr}$

• $\frac{nE}{R+r}$

A new flashlight cell of e.m.f. 1.5 volts gives a current of 15 amps, when connected directly to an ammeter of resistance 0.04 $\Omega$  . The internal resistance of cell is 

•  $0.04\Omega$  

•  $0.04\Omega$  

•  $0.04\Omega$  

•  $10\Omega$  

The figure shows a network of currents. The magnitude of currents is shown here. The current i will be

• 3 A

• 13 A

• 23 A

• – 3 A

The internal resistance of a cell is the resistance of

• Electrodes of the cell

• Vessel of the cell

• Electrolyte used in the cell

• Material used in the cell

If six identical cells each having an emf of 6V are connected in parallel ,the emf of the combination is

• 1 V

• 36 V

• 1/6 V

• 6 V

The maximum power drawn out of the cell from a source is given by (where r is internal resistance)

• $\frac{E^2}{2r}$

• $\frac{E^2}{4r}$

• $\frac{E^2}{r}$

• $\frac{E^2}{3r}$