Two Styrofoam peanuts each acquire the same charge. If they experience a force of repulsion of 2.4x10-3 N when separated by 4 µm, how many extra electrons does each peanut have?

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?

The velocity of sound wave in air at 35°c is 353m/s, calculate the velocity of sound at 46°c

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine