Can any one me on number 4? i do know that it’s not a cause i gotten that wrong on the first try.

State the right hand rule of the direction of magnetic field in a conductor carrying current

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant