Physics- Current Electricity

In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should

When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

In parallel combination of n cells, we obtain

In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will

A cell having an emf E and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum

An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be

In the series combination of two or more than two resistances

The resistivity of alloy manganin is