Author Question: Changing the magnetic field intensity in a copper coil induces A) current. B) voltage. C) both ... (Read 199 times)

RODY.ELKHALIL · **on:** Jul 29, 2018

Changing the magnetic field intensity in a copper coil induces

A) current.
B) voltage.
C) both of these
D) none of the above

Question 2

The intensity level of a Super-Silent power lawn mower at a distance of 1.0 m is 100 dB. You wake up one morning to find that four of your neighbors are all mowing their lawns using identical Super-Silent mowers.

When they are each 20 m from your open bedroom window, what is the intensity level of the sound in your bedroom? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 10-12 W/m2. A) 80 dB
B) 104 dB
C) 400 dB
D) 50 dB
E) 40 dB