Answer Posted / mithil

40W bulb will glow efficiently.
Because, Current in series connection is always same and
voltage is divided.
here, resistance of 40W bulb is higher than 100W bulb.
so current required to glow a 40W bulb is less than 100W
bulb(it is quite appeared from ratings).so current flowing
from the cicuit is according to the eq.resistance of both
bulb and that would not exceed that current,which can blow
off 40W bulb and less than current which fully glow the
100W bulb.remember formula I=V\R.
(note that bulb is purely resistive load)

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