At some instant and location, the electric field associated with an electromagnetic wave in vacuum has the strength 55.1 V/m. Find the magnetic field strength B, the total energy density u, and the power flow per unit area, all at the same instant and location. 1.84 x10-7 J/m3 B = u = E TOOLS x10 power flow per unit area: W/m?

The induced magnetic field at radial distance 7.6 mm from the central axis of a circular parallel-plate capacitor is 2.2 x 107 T. The plates have radius 2.3 mm. At what rate is the magnitude of the electric field between the plates changing? Number i Units

29.5. A magnetic flux of 50 µWb passes through a perpendicular loop of wire having an area of 0.78 m2. What is the magnetic flux density? Ans. 64.1 uT 28 6

consider a bright star in our sky. assume its distance from earth is 38.3 light-year (ly) and its power output is 4.00 * 10^28 W. about 100 times that of the sun. one light-year is the distance traveled by light through a vacuum in one year. a. find the intensity of the starlight at the earth. b. find the power of the starlight at the earth intercepts ( the radius of earth is 6.38 * 10^6 m .)

A (8.42x10^-1)-m radius cylindrical region contains a uniform electric field along the cylinder axis. It is increasing uniformly with time. What is the rate of change (magnitude) of the electric field required to obtain a total displacement current of (2.047x10^0) nA through a cross section of the region? Provide your answer in V/(m.s) with three significant figures.

An electric field with initial magnitude 210 V/m directed into the page and increasing at a rate of 13.0 V/(ms) is confined to the area of radius R = 15.0 cm in the figure below. If r = 45.0 cm, what are the magnitude and direction of the magnetic field at point A? magnitude direction ---Select--- Ø Ø A O R

Given: B = 5 * 10-5 T ẑ; σ = 4 (Ohm-meters)-1 (conductivity) a) Assume that seawater is moving at a constant velocity v = v0 ŷ and that the Earth’s magnetic field is along the ẑ-direction. Calculate the electric current density J produced by the magnetic force. Hint: first compute the force per unit charge, F/q, and then use the relationship J = σ(F/q).  b) Derive the equation of motion of a cylindrical differential volume element of base area δA and height δh parallelto the direction of J. Assume that seawater has a known volumetric mass density ρ. Show that this equation implies that the velocity satisfies the following differential equation:dvy/dt = vy/τwhere τ is a constant that you should write in terms of B, σ, and ρ.

The induced magnetic field at radial distance 5.8 mm from the central axis of a circular parallel-plate capacitor is 1.8 × 10-8 T. The plates have radius 4.0 mm. At what rate is the magnitude of the electric field between the plates changing? Number i Units

A 48 turn coil of wire creates a circular area of 6.95 cm2. If a magnetic field of 90.79 T hits this area at a right angle, what is the magnetic flux (in Wb) through the coil?