50 watts 100 watts bulbs connected in parallel which is more bright
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Power P=V^2/R
R=V^2/P
Resistance of bulb of higher watt has low resistance and vice versa. In series current flow in the two bulbs is the same. So heat produced per second is H=(I^2)R will be more in the bulb of low wattage and it will glow brighter.
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