Electric car maker Tesla roars up 6%

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Shares of Tesla Motors rose more than 6 per cent in their trading debut after the electric sports car maker's expanded flotation in New York raised more money than expected.

The company has not had a profitable quarter since it was founded in 2003, and has sold only 1,000 of its high-end Roadster sports cars. Investors are hoping that a planned lower-priced car will have a broader appeal.