Consider a homogeneous, isotropic conducting medium with material constants ε, μ, σ and no net charge. starting from the maxwell's equations derive the wave equations for the fields e(f, t) and b(a, t). (b) consider a plane wave of the type e(,t) exp(ikz - iut) traveling along the z-axis in the situation described in (a) (i) derive the dispersion relation showing howw and k are related. (ii) determine k assuming that im k 《 rek. (iii) under which conditions is the assumption of (ii) justified? (iv) after which distance ξ does the amplitude of the electric (or magnetic) field of the wave fall off by the factor 1/e? (c) repeat the calculation performed in (b), but in the "quasi stationary approximation" with the displacement current neglected, and derive the distance δ after which the amplitude of the electric (or magnetic) field of the plane wave is diminished by the factor 1/e. under which conditions is this "quasi stationary approximation" justified?

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.

i think the answer is a, hope this : )

a 2,000 calorie based diet.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.