A block in the shape of a rectangular solid has a cross-sectional area of 2.95 cm2 across its width. a fronttorear length of 19.6 cm, and a resistance of 1330 (1. The block's material contains 5.50 X 1'5)22 conduction electronsfm3. A potential difference of 43.2 V is maintained between its front and rear faces. {a} What is the current in the block? {b} If the current density is uniform, what is its magnitude?What are [c] the drift velocity of the conduction electrons and {d} the magnitude of the electric eld in the block? {a} Number n Units {b} Number n Units I I ( &lt