Would the bulb glow after completing the circuit shown in fig, if instead of safety pin we use an eraser?

Explain why the bulb would not glow in the arangement shown in figure.

An appratus was set up as shown in the figure. It was observed that when an aqueous solution of HCl was taken in the beaker and the circit was closed, the bulb in the circuit began to glow, but it did not glow when the experiment was repeated with glucose solution. what could be the reason? Would the bulb glow if the same experiment is repeated with an aqueous solution of NaOH? why?

An appratus was set up as shown in the figure. It was observed that when an aqueous solution of HCl was taken in the beaker and the circit was closed, the bulb in the circuit began to glow, but it did not glow when the experiment was repeated with glucose solution. what could be the reason? Would the bulb glow if the same experiment is repeated with an aqueous solution of NaCl? why?

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?

An capacitor C, a variable resistor R and a bulb B are connected in series to the ac mains in circuits as shown in Fig. The bulb glows with some brightness. How will the glow of the bulb change if the resistance R is increased keeping the same capacitance.

An capacitor C, a variable resistor R and a bulb B are connected in series to the ac mains in circuits as shown in Fig. The bulb glows with some brightness. How will the glow of the bulb change if a dielectric slab is introduced between the plates of the capacitor, keeping resistance R to be the same.

A multirange voltmeter can be constructed by using a galvanometer circuit as shown in Fig. EP 4.21. We want to construct a voltmeter that can measure 2V, 20V and 200 V using a galvanometer of resistance 10 Omega and that produces maximum deflection for current of 1 mA. find R_1 , R_2 and R_3 that have to be used.

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?