Current Electri...

Electromotive force of a cell is basically a 

Kirchhoff's first and second law shows the conservation of :-

Eight identical cells each of potential E and internal resistance r are connected in series  to form a closed circuit. An ideal voltmeter connected across 2 cells will read :-

Three unequal resistors in parallel are equivalent to a resistant 1 ohm. If two of them are in the ratio 1 :2 and if no resistance value is fractional, the largest of the three resistance in ohm is :-

In how many parts (equal) a wire of $$100\Omega$$ be cut so that a resistance of $$1\Omega$$ is obtained by connecting them in parallel?

Referring to the circuit, $$R$$ is the resistance of a potentiometer. As the sliding contact is moved from $$a$$ to $$b$$ the reading in the ideal ammeter will :

Two long straight cylindrical conductors with resistivities $$\rho_1$$ and $$\rho_ 2$$ respectively are joined together as shown in figure. If current I flows through the conductors, the magnitude of the total free charge at the interface of the two conductors is

In the electrolysis of NaCl

Eels are able to generate current with biological cells called electroplaques. The electroplaques in an Eel are arranged in 100 rows, each row stretching horizontally along the body of the fish containing 5000 electroplaques. The arrangement is suggestively shown below. Each electroplaques has an emf of 0.15 V and internal resistance of $$0.25\Omega $$. The water surrounding the Eel completes a circuit between the head and its tail. If the water surrounding it has a resistance of $$500\Omega $$, the current an Eel can produce in water is about :-

Two wires of resistance $$R_{1}$$ and $$R_{2}$$ at $$0^{o}C$$ have temperature coefficient of resistance $$\alpha _{1}$$ and $$\alpha _{2}$$, respectively. These are joined in series. The effective temperature coefficient of resistance is :-