The spatial coherence of output beam of a laser decreases if a mode-selective intra-cavity aperture is
used because the aperture introduces a high loss for
all other modes.
TRUE
FALSE

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

less than one you can't create energy

the force on the thing and the distance the force moves the thing