Alternating Current Set 5

In the previous question, if the direction of is reversed, will be

In an L-C-R series AC circuit the voltage across L, C and R is 10 V each. If the inductor is short circuited, the voltage across the capacitor would become

In an R-C circuit while charging, the graph of ln I versus time is as shown by the dotted line in the adjoining diagram where I is the current. When the value of the resistance is doubled, which of the solid curves best represents the variation of ln I versus time?

A conducting rod m is moving with a uniform speed in a uniform magnetic field = 4.0 T directed into the paper. A capacitor of capacity is connected as shown in figure. Then,

In order to obtain a time constant of 10 s in a circuit containing a resistance of , the capacity of the condenser should be

The current flowing in a step down transformer 220 V to 22 V having impedance 220 is

A transformer is having 2100 turns in primary and 4200 turns in secondary. An AC source of 120 V, 10 A is connected to its primary. The secondary voltage and current are

A magnet is suspended lengthwise from a spring and while it oscillates, the magnet moves in and out of the coil C connected to a galvanometer G. Then as the magnet oscillates.

An electric bulb has a rated power of 50 W at 100 V. If it is used on an AC source 200 V, 50 Hz, a choke has to be used in series with it. The should have an inductance of

An alternating current of frequency is flowing in a circuit containing a resistance and a choke in series. The impedance of this circuit is