Two bulbs of 500W and 300W are manufactured to operate on a 220V line.If their resis tance are R_(1) and R_(2) respectively then value of R_(1)/R_(2) is

Two bulbs of 500 watt and 200 watt are manufactured to operate on 220 volt line. The ratio of heat produced in 500 W and 200 W , in two cases, when firstly they are joined in parallel and secondly in series, will be

Two electric bulbs , rated for the same voltage , have powers of 200 W and 100 W , respectively. If their resistances are r_(1) and r_(2) , respectively , then

Two electric bulbs , rated at (25W,220V) and (100W,220V), are connected in series across a 220 V voltage source , if the 25W and 100W bulbs draw powers P_(1) and P_(2) Respectively , then :

A voltmeter of resistance 600 Omega when connected in turn across resistances R_(1) and R_(2) gives readings of V_(1) and V_(2) , respectively. If the battery is ideal, then

Six resistance each of value r=5 Omega are connected between points A, B and C as shown in figure. If R_(1), R_(2) and R_(3) are the net resistance between A and B, between B and C and between A and C respectively, then R_(1):R_(2):R_(3) will be equal to

Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100W, 60W and 40W bulbs have filament resistances R_(100), R_(60) and R_(40) , respectively, the relation between these resistances is