You are about to administer iontophoresis over the anterior surface of the patient's elbow. To avoid skin irritation by keeping the current density low, which of the following parameters should be used?
1. An electrode with an area of 12 cm² and a current amplitude of 4 mA
2. An electrode with an area of 6 cm² and a current amplitude of 3 mA
3. An electrode with an area of 4 cm² and a current amplitude of 4 mA
4. An electrode with an area of 4 cm² and a current amplitude of 3 mA
The solution will be posted in a few days
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