$\"\"$

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The function is $\"\"$ .

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From the definition of current : $\"\"$ .

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Consider $\"\"$ .

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Differentiate on each side with respect to $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$ .

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The current at time $\"\"$ is $\"\"$ .

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$\"\"$

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(a)

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Find the current at $\"\"$ .

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$\"\"$

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$\"\"$ .

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(b)

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Find the current at $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find the lowest current value.

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The current at time $\"\"$ is $\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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Find the lowest current value, by setting $\"\"$ .

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$\"\"$

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$\"\"$ .

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The current will be lowest at $\"\"$ .

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$\"\"$

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(a) $\"\"$ .

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(b) $\"\"$ .

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The current will be lowest at $\"\"$ .