Question 2) your cell phone operates at 1.9 ghz and transmits with an electric field strength of 100 v/m. assume air has a conductivity of 2 x 10−6 s/m, and a relative permittivity of ϵr=1 if the receiver in the cell tower can detect 100 mv/m, how far away can you still connect (in terms of m and enter your answer with at least 5 significant digits)? (assume the only effect is attenuation in the signal due to distance; ie not reduced from isotropic radiation).

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.