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You are given 5m5 m length of heating wire, it has resistance of 24Ω24 \Omega. It is cut into two and connected to 110110 volt line individually. The total power for the two half lengths is:

হানি নাটস

Resistance of the full wire =24ohm= 24 ohm

Since resistance is directly proportional to length.

\therefore Resistance of the half wire =12×24=12ohm= \displaystyle\frac{1}{2} \times 24 = 12 ohm

Power in one half =V.I.= V. I.

and V=IRV=IR

I=VRI=\dfrac{V}{R}

V=110voltsV=110volts

R=12ohmsR=12ohms

Power in one half= =110×11012= 110 \times \displaystyle\frac{110}{12}

=55×553watts= 55 \times \displaystyle\frac{55}{3} watts

Total power of two half lengths =2×55×553=60503= 2 \times 55 \times \displaystyle\frac{55}{3} = \displaystyle\frac{6050}{3}

= 2016.67 watts

=2000watts= 2000 watts (approximately)

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