49) Two electric bulbs with rating 100W, 220 V are connected in series to a 220V supply. Let the power dissipated be W1. Then the same bulbs are connected in parallel to the same supply. Let the power dissipated be W2. W1/W2 is

50) If the voltage applied to a resistor decreases by 1% and the value of the resistance increases by 1% what is the approximate change in the power consumption in the resistor?

51) Filament resistance of 20W bulb and 40W bulb, both rated to same voltage of operation is in the ratio

52) Two resistors with resistance R and 2R respectively are connected in parallel. If power consumed in resistor with resistance R is 20W, what is the power consumed in resistor with resistance 2R?

53) Which of the following is the commonly used depolarizer in dry cell