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A resistance coil of 60 ohm is immersed in 42 kg of water .A current of 7A is passed through it .the rise in temperature of water per minute is |
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Answer» RESISTANCE of coil ,R = 60 ohm MASS of WATER , M = 42kg current passing through it , I = 7A time taken , t = 1 min = 60 sec you know , heat dissipates , H = I²Rt = 7² × 60 × 60 = 49 × 3600 J we also know, Q = Ms ∆T here M is the mass of water , s is specific heat capacity. and ∆T is the temperature. so, Q = 42 × 4200 × ∆T now, Q = H 42 × 4200 × ∆T = 49 × 3600 ∆T = 1°C hence, temperature change is 1°C |
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