There are three possible defects to conside. In order of likelihood given what you've described...
1) The bake element is defective. You can remove it and check it with an ohm meter. A good one would be roughly 20 to 40 ohms, a bad element has high (or very high) resistance.
2) The oven thermostat. It controls both the bake and broil elements, but has seperate control circuits (contacts) for each. The bake element is used most and most likely to fail. You *can* check for voltage while its operating, but if you aren't sure of what you're doing its an unnecessary danger. If you eliminate the element (#1 above) and the wiring (#3 below) then the thermostat is what you have to replace.
3) The wiring from the thermostat to the bake element could be defective. (I'm sorry, I don't know if your bake element has a socket or just wiring. It is possible for a bad socket to burn and pit the element's contacts and to have to replace both.). This is the least common cause, but if you test the bake element resistance at the thermostat, that includes the wiring, and if the element by itself is good, but not with the wiring then its the wiring. Since the broil element works, the wiring feeding power to the thermostat is good, and the only wiring to check was from the thermostat to the bake element.
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