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Q.

Statement 1: Though the same current flows through the line wires and the filament of the bulb but heat produced in the filament is much higher than that in line wires.Statement 2: The filament of bulbs is made of a material of high resistance and high melting point.

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a

Both statements 1 and 2 are correct

b

Statement 1 is correct statement 2 is incorrect

c

Statement 1 is incorrect statement 2 is correct

d

Both statements 1 and 2 are incorrect

answer is A.

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Detailed Solution

As filament of bulb and line wire are in series, hence current through both is same. Now, because H=i2Rt4.2  and resistance of the filament of the bulb is much higher than that of line wires, hence heat produced in the filament is much higher than that in line wires.
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