Can we use multiple email address in an email field

4) Can we use multiple email address in an email field. It looks very odd to add each and every field which makes form lengthy.

To my understanding, you want to collect an email address in one field.

Please try the Infinite List widget. Here's the demo form: http://form.jotformpro.com/form/51302775889971

If that's not what you're trying to achieve, please provide more details so we can assist you properly. How many email field do you want to collect?