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Two parallel opposed, infinite black planes are maintained at 300?C and 400?C respectively. If the temperature difference is doubled by increasing the temperature from 400?C to 500?C, the heat exchange rate will increase by a factor of about

[A].	2.5	[B].	4.5
[C].	5.5	[D].	6.25
[E].	8.75

Answer: Option A

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