Zubeda made n electric circuit using a cell holder shown in fig.14.4, a switch and a bulb. When she put the switch in the 'ON' position, the bulb did not glow. Help zubeda in identifying the possible defects in the circuit.

In the circuit shown in fig. 14.25- Would any of the bulb glow when the switch is in the 'OFF' position?

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

Draw in your notebook the symbols to represent the following components of electric circuits: connecting wires, switch in the 'OFF' Position,bulb,cell,switch in the ON position, and battery.

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?

A small retangular coil ABCD contains 140 turns of wire. The sides AB and BC of the coil are of length 4.5 and 2.8 cm respectively, as shown in the figure The coil is held between the poles of a large magnet so that the coil can rotate about an axis thorugh its centre. The magnet produces a uniform magnetic field of flux density B between its poles. When the current in the coil is 170 mA, the maximum torque produced in the coil is 2.1 xx 10^-3 N m . The current in the coil in (a) is switched off and the coil s positioned as shown in the figure. The coil is then turned thorugh an angle of 90^@ in a time of 0.14 s. Calculate the average e.m.f. induced in the coil.