SaraNextGen Study App [2023-24]
Last Updated On 01-06-2023 - By Jeesha Sara

Three electric bulbs with same voltage ratings of 110 volts but wattage ratings of 40, 60 and 100 watts respectively are connected in series across a 220 volt supply line. If their brightness are  respectively, then

a)

b)

c)

d)

Bulbs will burn out due to the high voltage supply


Question ID - 150217 :-

Three electric bulbs with same voltage ratings of 110 volts but wattage ratings of 40, 60 and 100 watts respectively are connected in series across a 220 volt supply line. If their brightness are  respectively, then

a)

b)

c)

d)

Bulbs will burn out due to the high voltage supply

1 Answer
5876 Votes
3537

Answer Key : (a) -

(a)

Resistance of a bulb

For a given voltage

Rate of heat produced,

When the bulbs are connected in series, the current flowing through each bulb is same

 As



Next Question :

Consider a rectangular slab of length  and area of cross section  A current  is passed through it. If the length is doubled, the potential drop across the end faces

a)

Becomes half of the initial value

b)

Becomes one-fourth of the initial value

c)

Becomes double the initial value

d)

Remains same


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