A rigid container with thermally insulated walls contains a coil of resistance 100 ohm, carrying current 1A. Change in internal energy after 5 min will be

(a) 10 kJ

b) zero

(c) 20 kJ

(d) 30 kJ

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Solution

A/C to Joule's law of heating, the heat produced is given by : H = I²Rt = (1)²( 100 ) ( 5 x 60 ) = 30,000 J

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A rigid container with thermally insulated walls contains a coil of resistance 100 ohm, carrying current 1A. Change in internal energy after 5 min will be (a) 10 kJ b) zero (c) 20 kJ (d) 30 kJ

A/C to Joule's law of heating, the heat produced is given by : H = I2Rt = (1)2( 100 ) ( 5 x 60 ) = 30,000 J

A rigid container with thermally insulated walls contains a coil of resistance 100 ohm, carrying current 1A. Change in internal energy after 5 min will be

(a) 10 kJ

b) zero

(c) 20 kJ

(d) 30 kJ

A/C to Joule's law of heating, the heat produced is given by : H = I²Rt = (1)²( 100 ) ( 5 x 60 ) = 30,000 J