A potentiometer having wire of 4m length is connected to the terminals of a battery with a steady voltage.A leclanche cell has a null points at 1m,If the length of the potentiometer wire is increased by 1m,the position of the null points is

The emf of a Cu-Fe thermocouple varies with the temperature T of the hot junction, the cold junction being at 10⁰C, as V_inμv=14T-0.02T².Determinate the neutral temperature and the of inversion.

While connecting 6 cells in a battery in series,ina tape recorder,by mistake one cell is connected with reverse polarity.If the effective resistance of load is 24 ohm and internal resistance of each cell is one ohm and emf 1.5V,the current delivered by the battery is

A potentiometer having a 4m long wire is connected to the terminals of a battery of constant output voltage. A Leclanche cell has a balancing length of 1m. If the length of the potentiometer wire is increased by 1m, then the position of the null point is

Two wires of the same material but of different diameters carry the same current I. If the ratio of their diameters is 2 : 1, then the corresponding ratio of their mean drift velocities will be

In a thermo couple the temperature of the cold junction is 15⁰C.If the temperature of inversion is 485⁰C,the neutral temperature of the thermo couple is

The resistance of a conductor is 1.08Ω.To reduce it to 1Ω,the resistance that must be connected is

If π is Peltier coefficient,heat evolved at a junction when a current of 10 mA passes for 10 seconds in joules is

A galvanometer of resistance 20Ω is to be shunted so that only 1% of the current passes through it.shunt connected is

A cell of emf e₁ in the secondary circuit gives null deflection for1.5m length of potentiometer of wire length 10m.If another cell of emf e₂ is connected in series with e₁ then null reflection was obtained for 2.5 m length.Then e₁:e₂