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Question

If I varies inversely as d2 and I=20, when d=3, what is I when d=10?

A
6
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B
6623
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C
18
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D
1.8
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E
12
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Solution

The correct option is D 1.8
Given that I varies inversely with d2
Let the proportional constant be k.
We get I=kd2
At I=20, d is 3, so we get k=20×9=180
So, the equation becomes I=180d2
When d=10, we get I=180100=1.8

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