Why must astronomers use satellites and Earth-orbiting observatories to study the heavens at X-ray and gammaray wavelengths?

What is E field direction at center of square −2Q −Q 1. 0° 2. 45° x 3. 90° 4. 135° 5. 180° +2Q +Q PHY2049: Chapter 22 29 What is E field direction at center of square E −2Q −Q 1. 0° 2. 45° x 3. 90° 4. 135° 5. 180° +2Q +Q ! E field along each diagonal points to – charge ! x components cancel ! y components add PHY2049: Chapter 22 30 Uniformly Charged Straight Line Calculate the E field at a point above the midpoint of a uniformly charged line of length L P Ex= 0 (components cancel) Ey≠ 0 (components add) y P L PHY2049: Chapter 22 31 Uniformly Charged Straight Line P yP r ▯ L x