What is the primary difference between an ideal emf device and a real emf device?
a) The electric potential of a real emf device is limited.
b) The resistance of a real emf device is finite, but the resistance of an ideal emf device is assumed to be infinite.
c) A real emf device can carry an electric current, but an ideal emf device does not.
d) A real emf device has an internal resistance, but an ideal emf device does not.
Ans: d) A real emf device has an internal resistance, but an ideal emf device does not.
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Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2. What is the magnitude of the electric field at a point 2.0 cm from the center of the two surfaces?
A. 1.1 N/C B. 4.5 N/C C. 1.4 N/C D. 5.6 N/C E. 0.50 N/C
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a. SOFIA b. Chandra c. Kepler Space Observatory d. Hubble Space Telescope e. James Webb Space Telescope
Force on a Moving Charge: If a calculated quantity has units of T ? m/A, that quantity could be
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