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A railway compartment is lit up by thirteen lamps each taking 2.1 A at 15 V.  The heat generated per second in each lamp will be

a)

4.35 cal

b)

5.73 cal

c)

7.5 cal

d)

2.5 cal



Question ID - 151538 | SaraNextGen Top Answer

A railway compartment is lit up by thirteen lamps each taking 2.1 A at 15 V.  The heat generated per second in each lamp will be

a)

4.35 cal

b)

5.73 cal

c)

7.5 cal

d)

2.5 cal

1 Answer
127 votes
Answer Key / Explanation : (c) -

(c)

From Joule’s law, for a current carrying conductor at a definite temperature the rate of production of heat is given by

Where  is current,  the potential difference and  the time.

Given,

Also,

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