Create a New Web Application in SharePoint 2010 using PowerShell

To add new web application in SharePoint 2010 with PowerShell using New-SPWebApplication

New-SPWebApplication –applicationpool <Application pool name> -name <New App Name>
-applicationpoolaccount <service account> -port <Port Number>

Sample Command Line to create new Web Application in SharePoint 2010 using PowerShell

New-SPWebApplication –applicationpool SharePoint-80 -name SharePoint-80 
–applicationpoolaccount vSharePoint\SPAdmin -port 80