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If 240 J heat is generated in a conducto...

If 240 J heat is generated in a conductor of resistance 50 `Omega` when 0.2 A current is passed through it, then for how long is the current flowing through the conductor?

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The correct Answer is:
Current is passed through the conductor for 2 minutes.
`"Given: Heat (H) = 240J, Resistance (R) = 50"Omega`,
Current (I) = 0.2 A
To find: `" "` Time (t)
`"Formula: "H=I^(2)Rt`
`"Calculation: From formula,"`
`240=(0.2)^(2)xx(50)xxt`
`therefore" "240=0.04xx50xxt`
`t=(240)/(0.04xx50)`
`=(24xx100)/(4xx5)`
`="120 second"`
`therefore" "t=(120)/(60)`
`= " 2 minute"`
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