Answer the following statement(s) true (T) or false (F)
1. The function 
.
1. TRUE
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Solenoid: An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/A)
A. 0.0063 T B. 0.20 T C. 3.2 T D. 4.8 T E. 0.31 T
A 25-mF capacitor charged to 50 V and a capacitor C charged to 20 V are connected to each other, with the two positive plates connected and the two negative plates connected. The final potential difference across the 25-mF capacitor is 36 V. What is the value of the capacitance of C?
a. 43 mF b. 29 mF c. 22 mF d. 58 mF e. 63 mF
Which of the following people reorganized the spectral classification scheme into the one we use today and personally classified over 400,000 stars?
A) Annie Jump Cannon B) Williamina Fleming C) Cecilia Payne-Gaposchkin D) Henry Draper E) Edward Pickering
Quasars are common in the early Universe because ____ at that time
a. galactic collisions were more frequent b. black hole collisions were more frequent c. gas and dust clouds were denser d. galaxies were more isolated e. central bulges were larger