Current Electri...

A metallic conductor at 10$$^o$$C connected in the left gap of Meter Bridge gives balancing length 40 cm. When the conductor is at 60$$^o$$C, the balance point shifts by 5 cm. The temperature coefficient of resistance of the material of the wire

A cell of emf e$$_{1}$$ in the secondary circuit gives null deflection for 1.5m length of potentiometer of wire length 10m. If another cell of emf e$$_{2}$$ is connected in series with e$$_{1}$$then null deflection was obtained for 2.5 m length. Then e$$_{1}$$: e$$_{2}$$ is: 

The resultant resistance of two resistors when connected in series is 48 ohm. The ratio of their resistances is 3 : 1. The value of each resistance is

If the electric current in a lamp decreases by $$5\ \%$$, then the power output decreases by:

A series battery of six lead accumulators, each of emf 2.0V and internal resistance 0.50$$\Omega $$ is charged by a 100 V dc supply. The series resistance should be used in the charging circuit in order to limit the current to 8.0A is

If in a Wheatstone bridge the battery and Galvanometer are interchanged, the condition for balance

Two equal resistances are connected in the gaps of a meter bridge. If the resistance in the left gap is increased by $$10\%$$, the balancing point shift :

In a potentiometer experiment, the balancing length of potentiometer of a cell of e.m.f 1.5V in the secondary is 440 cm. A resistance  5$$\Omega $$ is connected between the terminals of cell, the balancing length is 400 cm.Then
a) internal resistance of the cell is 0.5$$\Omega $$
b) terminal voltage of the cell is 15/11V
c) Potential gradient of the potentiometer wire is $$\frac{1.5}{440}V/cm$$
d) potential difference across the potoentiometer wire of length 10m is nearly 3.4V

The V - I graph for a conductor at temperature T$$_{1}$$ and T$$_{2}$$ are shown in fig. 

(T$$_{2}$$ - T$$_{1}$$) is proportional to

The temperature coefficient resistivity of a material is $$0.0004/K$$. When the temperature of the material is increased by $$50^{o}C$$, its resistivity increases by $$2\times 10^{-8}\ ohm-meter$$.The initial resistivity of the material of the resistance