Yes, but you need an app for it.
The app called "Toggle Settings" allows you to have "profiles" such as those you'd find on other phones. There are 9 profiles in the app (Home, Internet, Location, Low Battery, Meeting, Night, Outdoor, and YouTube), and for each one you can set Airplane Mode, Auto Sync, Bluetooth, Fast Bright, Lock Screen, Orientation, Screen never timeout, Silent mode, WiFi, Brightness, Notification ringtone, Ringer mode (this ring and/or vibrate), Phone Ringtone, Screen timeout, and Volume (Ringer, Music, In-Call, Notification, and Alarm).
It also supports "rules". A rule can fire based on Time (it can be set to trigger on given days of the week too), a Calendar event, Battery less than %, Battery more than %, Charger Connected, GPS Enabled/Disables, or the Keyboard extended or not. When a rule fires, it can activate the profile of your choice, and terminate at a given time, or when the rule is no longer satisfied (e.g. when the charger is unplugged), or when the next profile is activated.
So, in your case, you could set one of the profiles (Low Battery, say) to set the Ring mode to "Ring only". Then set a rule trigger when the charger is plugged in that will activate the Low Battery profile. Done! From then on, whenever you plug the charger in the phone will set to Ring only (i.e. don't vibrate). When you unplug the charger it will revert to the previous setting - probably "Vibrate only" if you've set your home profile to set that.

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