What type of image is formed by refracting telescope?

What is the magnitude of the resultant vector round your answer to the nearest tenth

What are two different ways you could find the value of a? explain these methods.

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=