Two students X and Y performs an experiment on potentiometer separately using the ciruit diagram shown in the fig keeping other things unchanged
Y decreases the value of resistance S in the set up.
How would these changes affect the position of null point in each case and why?

Two students X and Y performs an experiment on potentiometer separately using the ciruit diagram shown in the fig keeping other things unchanged X increases the value of resistance R. How would these changes affect the position of null point in each case and why?

Three students X,Y and Z performed an experiment for studying the variation of alternating currents with angular frequency in a series LCR-circuit and obtained the graphs shown in the figure They all used a.c sources of the same r.m.s. value and inductances of the same value. What can we conclude about the capacitance value. What can we conclude about nature of the impedance of the set up at frequency omega_0 ?

Three students X,Y and Z performed an experiment for studying the variation of alternating currents with angular frequency in a series LCR-circuit and obtained the graphs shown in the figure They all used a.c sources of the same r.m.s. value and inductances of the same value. What can we conclude about the resistance values used by them

Two identical plane metallic surfaces A and B are kept parallel to each other in air separated by a distance of 1.09 cm as shown in Fig. HQ 6. Surface A is given a positive Potential of 10 V and outer surface of B is earthed. What is the work done in moving a charge of 20 muC from point X to Y. Where X is situated on surface A?