How could superconducting magnets be used for short term energy storage?
What will be an ideal response?
Circulating currents cause magnetic fields. If materials are strong enough,
considerable energy densities can be accommodated. Such systems could be important in
providing backup energy to correct for momentary surges in the grid.
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The light from Polaris is 24.2 times less intense than the light received from Sirius. Which star is the truly brighter star, that is, emitting more visual light at its surface?
a. Polaris b. Sirius c. Neither, they emit the same amount at their surfaces. d. This cannot be determined based upon the information given.
How is Pluto's moon system thought to have formed?
A) from a giant impact B) by gravitational capture of passing asteroids C) by gravitational capture of passing comets D) by stealing them during a close encounter with Neptune
Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are separated by 0.30 m. Find the magnetic force per unit length between the two wires
A) 2.7 × 10-5 N repulsive B) 7.2 × 10-5 N repulsive C) 3.4 × 10-5 N attractive D) 2.7 × 10-5 N attractive E) 7.2 × 10-5 N attractive
An air-filled 39.1 ?H solenoid has a length 4.0 cm and cross-sectional area 0.60 cm2. How many turns are in this solenoid?
A) 1200 B) 12 C) 120 D) 144 E) 21000