Which of the following statement about the electromagnet shown above is correct?

Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm

The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the

A car moving at 20m/s with its horn blowing (f = 1200Hz) is chasing another car going at 15m/s. What is the apparent frequency of the horn as heard by the driver being chased?

Any line or section taken through an advancing wave in which all the particles are in the same phase is called the