Write an equation for the magnetic field vector B generated by the current at an arbitrary point in terms of I, the length element dl, and the vector for the distance R from dl to the point.

Matter that emits no light at any wavelength is called

Which wave is the result of amplification and produces a louder sound

You need to fill a basketball with air to play with it. you know that your pump expels air at a velocity of 6 cm/s. you know that the volume flow rate of air being pumped into the basketball is 103 cm^3/s. what is the diameter of your needle?