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Q.

A direct current of 2 A and an alternating current having a maximum value of 2 A flow through two identical resistances. The ratio of heat produced in the two resistances will be

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a

1:1

b

1:2

c

2:1

d

4:1

answer is C.

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Detailed Solution

HDC=I2Rt=22Rt jouleHAC=I2Rt=I022Rt=222Rt∴ =H(DC)H(AC)=21
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A direct current of 2 A and an alternating current having a maximum value of 2 A flow through two identical resistances. The ratio of heat produced in the two resistances will be