3. A conducting fluid is contained in the space between two concentric spherical electrodes. (A two-dimensional sketch of this unree-dimensional apparatus is shown below.) The inner electrode has a diameter of 1 cm and the outer electrode has a diameter of 3 cm. The current flowing between the electrodes is 2 A. Calculate the current density at both electrodes. 020-2

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.