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A coil is connected to an analogue centre zero ammeter. A magnet is dropped (North pole first) so that it falls vertically and completely through the coil. What would be observe on the ammeter?

The ammeter's needle would first be deflected one way, then as the direction of the current reversed, it would deflect the other way.
LV
Answered by Lucy V. • Physics tutor
4389 Views

An electromagnetic wave has a wavelength of 3.0m and a speed of 3x10^8 m/s. State what type of radiation this wave is and calculate the period of the wave.

For the first part we know that the wavelength is over 1.0 m so it is a radio wave.To find the period we first find the frequency as the period is the reciprical of the frequency. (T = 1/f).To find the frequ...
AP
Answered by Anna P. • Physics tutor
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Two students are provided with a starting pistol, a stopwatch and a long measuring tape. The starting pistol produces a loud sound and a puff of smoke. Describe how the students use the apparatus to calculate the speed of sound.

The students stand at a distance of 200 m from each other (measured with the measuring tape). Student 1 fires the pistol, Student 2 starts the stopwatch when they see smoke from the pistol and stop it when t...
JM
Answered by Josh M. • Physics tutor
15571 Views

Describe the generator effect and its use within transformers (6 marks)

The generator effect is the induction of a potential difference (leading to a current) when a wire experiences a change in magnetic field) (2 marks)In a transformer, there are primary and secondary coils. An...
TM
Answered by Tobias M. • Physics tutor
16771 Views

Show that a mass on a spring obeys simple harmonic motion.

Let the mass be m . Let the natural length of the spring be L . The defining equation of simple harmonic motion (SHM) is that the acceleration is proportional to, and acts in the opposite direction to, the d...
TJ
Answered by Tia J. • Physics tutor
7950 Views