Musk also agreed with an analyst who said Apple's entry into the market could push "broader consumer acceptance of electric vehicles."
Musk has previously said he'd like to see as many electric car competitors as possible. He started Tesla because he wanted to speed up the transition from gas-powered cars to electric cars in order to address the threat of climate change. He has opened all of Tesla's patents to the public to spur greater development of electric cars.
Apple (, Tech30) hasn't commented, but it is widely reported to be looking at building cars.
Musk also addressed the fact that Tesla and Apple are hiring each other's employees, but said Tesla isn't suffering from brain drain. In fact, he said that Tesla has hired about five times as many people from Apple as Apple has recruited from Tesla over the last 12 months.
Cook gave an evasive answer, saying "we don't have a relationship with Tesla."
Last week Sergio Marchionne, CEO of Fiat Chrysler Automobiles, said he's open to partnering with Apple. "I think we should encourage that dialogue. All of us should encourage it."
Marchionne added that Apple and other tech companies would pose a tremendous threat to the auto industry if it moves into the sector.
"If they show up and they are truly successful, with their cash piles and know-how, they could fundamentally hurt this industry, " he said.
You might also like: