A standing wave on a string is given by: y(x, t) = 0.04sin⁡(2πx)cos⁡(100πt), where x and y are in meters and t is in seconds. The left end of the string is located at x = 0. The location of the 5th antinode is at:

i guess it’s a and b

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current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete