A. 4

B. 3

C. 2

D. 1

If the cold junction is held at 0^{0}C, the same thermo emf V of a thermocouple varies as V = 10 x 10 6t - * x 10 bt2, where t is the 40 temperature of the hot junction in ^{0}C. The neutral temperature and the maximum value of thermo emf are respectively:

A cell in secondary circuit gives null deflection for 2.5 m length of potentiometer having 10 m length of wire If the length of the potentiometer wire is increased by 1 m without changing the cell in the primary, the position of the null point now is <br>

Resistances are connected in the two gaps of a meter bridge.The balance point is 20cm from the zero end.When a 15Ω resistor is connected in series with the smaller resistance then the null point shifts to 40cm.the smaller resistance is

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

(A): bending of a conducting wire effects electrical resistance

(R): Resistance of a wire depends on resistivity of that material