What is the magnification of a virtual image if the image is 10.0 cm from a mirror and the object is 20.0 cm from the mirror? d Use the equation m = - d. O A. 0.50 O B. -0.50 O C. 2.0 O D. -2.0​

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.