Is this corn in full sun?

Yes, full sun.

The tassels always come out first. Ears will develop in a few days.

Also, the corn will get taller after the tassels appear. The space between the nodes (between where the leaves come off the stalk) will continue to lengthen.

Corn grown agriculturally is often taller than home grown, but yours will still get some height and you will probably see silks in about a week.

Patience.

*wink*

My corn is only about 4 inches long. Silks are almost completely dry. Does not get more than 4 hours of full sun. Last two weeks dry so I watered. Is my corn done growing? They are so tiny!

All things being equal, some corn only gets 5 ft tall. Other varieties will will be 9 to 10 ft. Some varieties will produce 3 ears per stalk but the third ear will be under developed. That's because it emerges too late to polinate. Corn has to have high nitrogen, water and sun. When silks turn brown, their done.

Our corn did that, too. Stalks matured at 3 to 3-1/2 feet, ears no more than 4" long, and even then most of them only about 2/3 filled out. We aren't sure what happened. Very disappointing; it was Peaches & Cream, one of my most favorite varieties. WAAAH.

If temp's are in the 90's, corn will not pollinate completely. Each silk produces 1 grain of corn. When they are dry it's too late.