The quantity of charge q (in coulombs) that has passed through a surface of area 2.10 cm2 varies with time according to the equation q = 4t3 + 3t + 6, where t is in seconds. (a) What is the instantaneous current through the surface at t = 0.950 s?  A (b) What is the value of the current density?  kA/m2

A wire 3.77 m long and 6.81 mm in diameter has a resistance of 20.6 mΩ. A potential difference of 26.6 V is applied between the ends. What is the magnitude of the current density?  Current in the wire is 1291.26 A Answer isnt 11284400, 3547400000,

Part A:If there is an annealed copper wire with resistivity 0.172 nano ohm meters and a diameter of 2mm placed in an electric field of 16,000N/C, then how much current will go through the wire? Part BIf this wire (the same as in part A) has an electron density of 8.5x10^28 m^-3 then what is the drift velocity of the electrons in this wire? The charge of each electron is, as usual, 1.602x10^-19C.

Suppose 1.67 Cof charge passes through the filament of a light bulb in 2.00 seconds. How many electrons pass through the filament in 5.00 s? Express all numerical values in three significant figures. The current in the light bulb is: milliamperes The total amount of charge passing through the filament in t=5.00 s is: coulombs Since a single electron has a charge of -1.60 × 10¬19 C, the number of electrons passing through the filament in t=5.00 s is: N= x 1019 electrons