The rain-soaked shoes of a person may explode if ground current from nearby lightning vaporizes the water. The sudden conversion of water to water vapor causes a dramatic expansion that can rip apart shoes. Water has a density of 1000 kg/m^3 and requires 2256 kJ/kg to be vaporized. If a horizontal current lasts 2.00 ms and encounters water with resistivity 150 Ω·m, length 12 cm, and vertical cross-sectional area 15×10^−5 m^2, what average current is required to vaporize the water?

What Hall voltage is produced by a 0.180-T field applied across a 2.6-cm diameter aorta when blood velocity is 55.0 cm/s? (in mV)

Figure CQ19.7 shows a coaxial cable carrying current I in itsinner conductor and a return current of the same magnitudein the opposite direction in the outer conductor. Themagnetic field strength at r = r0 is B0. Find the ratio B /B0 at(a) r = 2r0 and (b) r = 4r0.

22) An x-ray tube used for cancer therapy operates at 4.0 MV, with a beam current of 25 mA striking a metal target. Nearly all the power in the beam is transferred to a stream of water flowing through holes drilled in the target. What rate of flow, in kilograms per second, is needed if the rise in temperature (ΔT) of the water is not to exceed 50 C ?

What is the displacement current density? a) The current density due to the motion of charges in a conductor. b) The current density due to the motion of charges in a dielectric. c) The current density that arises from time-varying electric fields in free space. d) The current density that arises from the magnetic fields produced by moving charges. In what form can Ampere-Maxwell's equation be written in the absence of a time-varying electric field? a) V. E = p/ɛo b) VxE=-ƏB/ət c) V x H = J d) VB=0 What does the integral form of Ampere-Maxwell's equation relate to? a) The electric field generated by a time-varying magnetic field. b) The magnetic field generated by a time-varying electric field. c) The relationship between the current density and the magnetic field. d) The behavior of electromagnetic waves in free space. e) None In the integral form of Ampere-Maxwell's equation, what does the surface integral of the displacement current density represent? a) The total charge enclosed by…