A coil Q is connected to low voltage bulb B and placed near another coil P as shown in the fiugre. Give reasons to explain the following observations :
(a) The bulb 'B' lights.
(ii) Bulb gets diameter if the coil Q is moved towards left.

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when

Two identical incandescent light bulbs are connected as shown in figure. When the circuit is an AC voltage source of frequency f, which of the following observations will be correct.

Three identical circular coils A, B and C are placed coaxial (with planes parallel to each other) The coils A and C equal currents in opposite direction as shown. The coils B and C are fixed in positions and the coil A is moved towards B wiyj uniform motion then -

Potentiometer wire PQ of 1 m length is connected to a standard cell E_(1) . Another cell E_(2) of emf 1.02 V is connected with a resistance r and a switch S as shown in the circuit diagram. With switch S open, the null position is obtained at a distance of 51 cm from P . (i) Calculate the potential gradient of the potentiometer wire. (ii) Find the emf of cell E_(1) . (iii) When switch S is closed, will the null point move toward P or toward Q ? Give reason for your answer.

An inductor L, a resistanc eR and two identical bulbs B_(1) and B_(2) are connected to a battery through a switch S as shown in the figure . The resistance of coil having inductance L is also R. Which of the following statement gives the corrrect description of the happenings when the switch S is closed?

Meeta father was driving her to the school. At the traffice signal she noticed that each traffic light was made of many tiny lights instead of a signal bulb. When Meeta asked this question to her father's he explained the reason for this. Answer the following question based on above information: (i) What were the values displayed by Meeta and her father? (ii) What answer did Meeta's father give? (iii) What are the tiny light in traffice signal called and how do these operate?

Two identical blocks A and B, each of mass m=3kg , are connected with the help of an ideal spring and placed on a smooth horizontal surface as shown in Fig. Another identical blocks C moving velocity v_0=0.6(m)/(s) collides with A and sticks to it, as a result, the motion of system takes place in some way Based on this information answer the following questions: Q. After the collision of C and A, the combined body and block B would

Two identical blocks A and B, each of mass m=3kg , are connected with the help of an ideal spring and placed on a smooth horizontal surface as shown in Fig. Another identical blocks C moving velocity v_0=0.6(m)/(s) collides with A and sticks to it, as a result, the motion of system takes place in some way Based on this information answer the following questions: Q. After the collision of C and A, the combined body and block B would

Two identical blocks A and B, each of mass m=3kg , are connected with the help of an ideal spring and placed on a smooth horizontal surface as shown in Fig. Another identical blocks C moving velocity v_0=0.6(m)/(s) collides with A and sticks to it, as a result, the motion of system takes place in some way Based on this information answer the following questions: Q. Oscillation energy of the system i.e. part of the energy which is oscillating between potential and kinetic forms

Two identical blocks A and B, each of mass m=3kg , are connected with the help of an ideal spring and placed on a smooth horizontal surface as shown in Fig. Another identical blocks C moving velocity v_0=0.6(m)/(s) collides with A and sticks to it, as a result, the motion of system takes place in some way Based on this information answer the following questions: Q. Oscillation energy of the system i.e., part of the energy which is oscillation (changing) between potention and kinetic forms is