The radio signals from Earth are greater than from the Sun
Indicate whether the statement is true or false
TRUE
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The leaves of a positively charged electroscope diverge more when an object is brought near the knob of the electroscope. The object must be:
A) a conductor B) an insulator C) positively charged D) negatively charged E) uncharged
A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is ?. You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?
A) 8 ? B) 4 ? C) ?/2 D) ? E) ?/8
A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the capacitance in this circuit?
A) 17 ?F B) 16 ?F C) 15 ?F D) 14 ?F E) 13 ?F
A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1 . The field at (0, 0, 1.0 m) is in the positive z direction. 2 . The field at (0, 1.0 m, 0) is in the negative y direction. 3 . The field at
(1.0 m, 0, 0) is zero. 4 . The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these