Summary of traditional lc oscillation experiments

1. How many times has the current direction changed in a cycle?

It can be said that it is once, if the current is zero at the beginning of the cycle.

It can also be said to be twice, if the current is not zero at the beginning of the cycle.

So this is a word game, so don't worry about it.

As for why it should be twice instead of once, consider how many times the current direction has changed in 10 cycle.

If the current is 0 at the beginning of the period, it has changed 19 times.

If the current is not 0 at the beginning of the cycle, change it 20 times.

So obviously, the relationship between the number of changes and the number of cycles is twice, not twice.

As for the difference, it is only the difference between y=2n and y=2n- 1, that is, the difference of initial values.

2. It takes half a period to change from full magnetic field to full electric field.