Ablock in the shape of a rectangular solid has a cross-sectional area of 5.24 cm2 across its width, a front-to-rear length of 15.7 cm, and a resistance of 977 ω. the block's material contains 4.45 × 1022 conduction electrons/m3. a potential difference of 39.9 v is maintained between its front and rear faces. (a) what is the current in the block

The current through the block is 40.8mA

Explanation:

For question a we can apply the macroscopic form of Ohm's law:

where:

V= potential difference

R= The resistance of the block

substituting the values on the formula we have:

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