Current Electri...

Two non-ideal batteries are connected in series. Consider the following statements:
(A) The equivalent emf is larger than either of the two emfs.
(B) The equivalent internal resistance is smaller than either of the two internal resistances

Consider the following two statements:
(A) Kirchhoff's Junction Law follows from conservation of charge.
(B) Kirchhoff's Loop Law follows from conservative nature of electric field.

A uniform wire of resistance $$50\Omega$$ is cut into 5 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is

The two cells are connected in series, in a potentiometer experiment, in such a way so as to support each other and to oppose each other. The balancing lengths in two conditions are obtained as 150 cm and 50 cm respectively. The ratio of emf's of two cells will be

A student connects four cells, each of internal resistance $$\dfrac{1}{4}\Omega$$, in series. One of the cells is incorrectly connected because its terminals are reversed. The value of external resistance is $$1\Omega$$. If the emf of each cell is 1.5 volt then current in the circuit will be

The resistance of an iron wire is $$10\Omega$$ and its temperature coefficient of resistance is $$5\times 10^{-3}/^oC$$. A current of 30 mA is flowing in it at $$20^oC$$. Keeping potential difference across its ends constant, if its temperature is increased to $$120^oC$$ then the current flowing in the wire will be (in mA)

In an experiment of Wheatstone bridge, if the positions of cells and galvanometer are interchanged, then the balance points will

Which of the following statements is/are correct for potentiometer circuit?

If I current is flowing in a potentiometer wire of length $$L$$ and resistance $$R$$, then potential gradient will be

In the following circuit the resistance of wire AB is $$10\Omega$$ and its length is 1m. Rest of the quantities are given in the diagram. The potential gradient on the wire will be