NEW YORK—Apple Inc. on Tuesday added 5G connectivity to its low-cost iPhone SE and iPad Air and introduced a faster chip for a new desktop, a high point in Apple’s move to power its devices with microprocessors designed in house. The new Studio desktop starts at $3,999 with the new M1 Ultra chip. The iPad Air also got Apple’s M1 chip that was developed for laptops. “Apple Silicon strategy is the key highlight,” said analyst Neil Shah of Counterpoint Research. “Apple is scaling the portfolio of its in-house semiconductor capabilities to power a broader set of richer devices from affordable iPhone SE to the most powerful product Mac Studio.” Apple’s Mac Pro still runs on Intel Corp. microprocessors. Apple slightly hiked the price on the iPhone SE to $429 from $399 for the previous model. The new phone starts shipping March 18. The iPhone SE comes with an A15 Bionic …