A laser pulse has an energy of 21 J and a beam radius of 2 mm. The pulse duratio

Question

A laser pulse has an energy of 21 J and a beam radius of 2 mm. The pulse duration is 13 ns and the energy density is constant within the pulse.

(a) What is the spatial length of the pulse?
_______m

(b) What is the total energy density within the pulse?
_______kJ/m^3

(c) Find the electric and magnetic amplitudes of the laser pulse.
E0 =_________MV/m

B0 =_________T

A parallel-plate capacitor in air has circular plates of radius 3.0 cm separated by 1.1 mm. Charge is flowing onto the upper plate and off the lower plate at a rate of 7 A. Find the time rate of change of the electric field between the plates.

_________V/m per second

Watch out for the units

Explanation / Answer

a) is 13e-9 * 3e8

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