Athick copper wire connected to a voltmeter surrounds a region of time-varying magnetic flux, and the voltmeter reads 10 volts.

if instead of a single wire we use a coil of thick copper wire containing 23 turns, what does the voltmeter read?

230 Volts

Explanation:

Emf of a solenoid is given by

Where,

N = Number of turns

= Magnetic flux

t = Time taken

The negative sign denotes the direction of flow or polarity.

It can be seen that the induce emf is proportional to the number of turns.

So, if the initial voltage was 10 volts at a set number of turns then at 23 volts the emf will be

230 Volts

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..