Germanium to which 1024 m-3 ga atoms have been added is an extrinsic semiconductor at room temperature, and virtually all the ga atoms may be thought of as being ionized (i. e., one charge carrier exists for each ga atom). calculate the electrical conductivity of this material in (ω·m)-1 , assuming electron and hole mobilities of 0.26 and 0.020 m2 /(v·s), respectively

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.

2. circled insects have mutations, or changes to their dna. how many of the offspring insects in this generation have mutations?

Athird point charge q3 is now positioned halfway between q1 and q2. the net force on q2 now has a magnitude of f2,net = 5.861 n and points away from q1 and q3. what is the value (sign and magnitude) of the charge q3?