A 15-?F capacitor is connected to a 50-V battery and becomes fully charged. The battery is removed and a slab of dielectric,
having a dielectric constant of 5.0, is inserted between the plates and completely fills the space between them.
(a) What is the capacitance of the capacitor after the slab is inserted?
(b) What is the potential difference across the capacitor with the dielectric inserted.
(a) 75 µF (b) 10 V
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An ac generator consists of a coil with 40 turns of wire, each with an area of 0.06 m2. The coil rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 55Hz. What is the maximum induced emf?
A) 110 V B) 625 V C) 200 V D) 421 V E) 332 V
The Moon's surface gravity is only half the Earth's
Indicate whether the statement is true or false
The distance between two successive ‘like' points on a wave is the wave's wavelength
a. True b. False Indicate whether the statement is true or false
A current can be made to flow in a wire if
a. it is connected to a battery. b. it is put into motion near a magnet. c. a magnet is put into motion near it. d. all of the above.