39. At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel) ? (b) 193 (c) 293 (d) 393 40. If the potential difference between the ends of a fixed resistor is halved, the electric power will become : (a) double (b) half (c) four times (d) one-fourth (a) 93 Effects

At a given time, a house is supplied with 100A at 220V. How many 75W, 220V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?

The resistance of a resistor is reduced to half of its initial value. In doing so, if other parameters of the circuit remain unchanged, the heating effects in the resistor will become (A) two times (B) half (C) one - fourth (D) four times

The resistance of a resistor is reduced to half of its initial value. In doing so, if other parameters of the circuit remain unchanged, the heating effects in the resistor will become (A) two times (B) half (C) one - fourth (D) four times

There are two electric bulbs rated 60W. 110V and 100W, 110V. They are connected in series with a 220V d.c. supply. Will any bylb fuse? What will happen if they are connected in parallel with the same supply?

There are two electric bulbs rated 60W. 110V and 100W, 110V. They are connected in series with a 220V d.c. supply. Will any bylb fuse? What will happen if they are connected in parallel with the same supply?

Two 220 V, 100 W bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 V a.c. supply line. The power drawn by the combination in each case respectively will be

(a) Two heater coils made of the same material are connected in paralled across the mains. The length of diameter of one the coil is triple that of other. Which of these will produce more heat? (b) Three equal resistors connected in series across a source of emf together dissipated 10 Watt of power. What would be the power disspated if the same resistors are connected in parallel across the same source of emf? Two resistor R_(1) and R_(2) may be connect either in series or in parellel across a battery of zero internal resistance. it is required that joule heating for the parallel combination be four times than for series combination. if R_(1)= 100 Omega find R_(2) (d) The three resistance A, B and C have values 3R, 6R and R respectively. Now some potential difference is applied across the network . Find the ratio of thermal powers dissipated between X and Y . find ratio of power consumed by A,B, and C .

A parallel plate capacitor is charged by a battery after some time, the battery is disconnected and a dielectric slab with its thicnkess equal to the plate so reparation is insected between the plates. How will (i) the capacitance of the capacitor (ii) potential difference between the plates & (iii) the energy sotred in the capacitor the affected ? Q_(0) -charge V_(0) - potential difference, C_(0) - capacitance, E_(0) electric field. U_(0) - energy spred, before the dielectric slab is inserted. Q_(0)=C_(0) V_(0), (V_(0))/(d), U_(0)=(1)/(2)C_(0)V_(0)^(2)?