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# Solution: At what rate is the current changing at the instant when the resistance is 6 ohms?

#### Problem Statement: EE Board October 1993

A standard cell has an emf โEโ of 1.2 volts. If the resistance โRโ of the circuit is increasing at the rate of 0.03 ohm/sec, at what rate is the current โIโ changing at the instant when the resistance is 6 ohms? Assume Ohmโs law E = IR.

• A. -0.002 amp/sec
• B. 0.004 amp/sec
• C. -0.001 amp/sec
• D. 0.003 amp/sec

The current changing at -0.001 amp/sec

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