Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Discrete transistors are individually packaged transistors. Transistors come in many different semiconductor packages (see image). The two main categories are through-hole (or leaded), and surface-mount, also known as surface-mount device (SMD). The ball grid array (BGA) is the latest surface-mount package (currently only for large integrated circuits). It has solder "balls" on the underside in place of leads. Because they are smaller and have shorter interconnections, SMDs have better high-frequency characteristics but lower power rating.
What is a ball grid array composed of?
A: solder "balls" on the underside in place of leads

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
This is a consequence of Lorentz reciprocity. For an antenna element not connected to anything (open circuited) one can write . But for an element which is short circuited, a current is generated across that short but no voltage is allowed, so the corresponding . This is the case, for instance, with the so-called parasitic elements of a Yagi-Uda antenna where the solid rod can be viewed as a dipole antenna shorted across its feedpoint. Parasitic elements are unpowered elements that absorb and reradiate RF energy according to the induced current calculated using such a system of equations.
When is the element not allowed voltage?
A: short circuited

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The distances passengers need to move within a large airport can be substantial. It is common for airports to provide moving walkways and buses. The HartsfieldJackson Atlanta International Airport has a tram that takes people through the concourses and baggage claim. Major airports with more than one terminal offer inter-terminal transportation, such as Mexico City International Airport, where the domestic building of Terminal 1 is connected by Aerotren to Terminal 2, on the other side of the airport.
How far is the distance passengers need to move between buses?
A: unanswerable

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West, alongside his mother, founded the "Kanye West Foundation" in Chicago in 2003, tasked with a mission to battle dropout and illiteracy rates, while partnering with community organizations to provide underprivileged youth access to music education. In 2007, the West and the Foundation partnered with Strong American Schools as part of their "Ed in '08" campaign. As spokesman for the campaign, West appeared in a series of PSAs for the organization, and hosted an inaugural benefit concert in August of that year.
With the help of his mom, what foundation did Kanye create early in his career?
A:
Kanye West Foundation