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Two tungsten lamps A and B of resistance...

Two tungsten lamps `A` and `B` of resistances `R_(1)` and `R_(2)` respectively are connected in a circuit of negligible internal resistance, if `R_(1) gt R_(2)`
(i) The lamp `A` will glow brightly if lamps are connected in series
(ii) the lamb `A` will glow brightly if lamps are connected in parallel
(iii) the lamp `B` will glow brightly if lamps are connected in series.
(iv) the lamb `B` will glow brightly if lamps are connected in parallel

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Two tungsten lamps with resistances R_(1) and R_(2) , respectively , are connected first in parallel and then in series in a lighting circuit of negligible internal resistance. Given R_(1) gt R_(2) . (a) Which lamp will glow more brightly when they are connected in parallel ? (b) If the lamps of resistance R_(1) now burns out, how will the net illumination produced change ? (c ) Which lamp will glow more brightly when they are connected in series ? (d) If the lamp of resistance R_(2) now burns out and lamp R_(1) alone is plugged in , will the net illumination increase or decrease ?

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