During wireless charging galaxy note 8 on charging pad,there is slight noise coming. Help?

While charging the Samsung Galaxy Note 5, the fan inside the Wireless charger will activate to cool the charger. On this process, you may hear a slight sound however this is intended concept to prevent charger overheating and normal operation.

You can reduce noise by deactivating the fan. You can deactivate fan from Fast wireless charging switch under Accessory settings.