Changes in SharePoint Powershell CAML Query Effect not Taken - powershell

Question

In my CAML query for a SharePoint Power-shell script, the changes made in the CAML query is not taken effect.
May I know what am I doing wrong in my code snippet below?
cls
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
#Set config variables
$baseUrl="http://test.com/"
$RDlistName ="RecordsDocument/Forms/TestReport"
#Get Web and List Objects
$web = Get-SPWeb $baseUrl
$RDlist = $web.Lists[$RDlistName]
#Define the CAML Query
$RDquery = New-Object Microsoft.SharePoint.SPQuery
$RDquery.Query = "#
<Where>
<Eq>
<FieldRef Name='ContentType' />
<Value Type='Text'>Folder Content Type</Value>
#changes to above filter with an incorrect value still returns result *****
</Eq>
</Where>"
#Get List Items matching the query
$RDitems = $RDlist.GetItems($RDquery)
$RDcount = 1
Write-host "Total Number of Folders in RecordsDocument:"$RDitems.count
Write-host ""
#Loop through Each Item
ForEach($RDitem in $RDitems)
{
#Do something
Write-host $RDcount"." $RDitem["Title"] "|" $RDitem["ContentType"]
foreach($RDroleAssignment in $RDitem.RoleAssignments)
{
Write-Host - $RDroleAssignment.Member.Name
}
$RDcount +=1
}
EDIT: In addition, the following error was observed..
You cannot call a method on a null-valued expression. At
D:\User\test.ps1:25 char:1
$RDitems = $RDlist.GetItems($RDquery)
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull

Answer 1

My test script(hope it helps):
if ((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null) {
Add-PSSnapin "Microsoft.SharePoint.PowerShell"
}
#Set config variables
$baseUrl="http://site/"
$RDlistName ="MyDoc"
#Get Web and List Objects
$web = Get-SPWeb $baseUrl
$RDlist = $web.Lists[$RDlistName]
#Define the CAML Query
$RDquery = New-Object Microsoft.SharePoint.SPQuery
$RDquery.Query = "#
<Where>
<Eq>
<FieldRef Name='ContentType' />
<Value Type='Computed'>Folder</Value>
</Eq>
</Where>"
#Get List Items matching the query
$RDitems = $RDlist.GetItems($RDquery)
$RDcount = 1
Write-host "Total Number of Folders in RecordsDocument:"$RDitems.count
Write-host ""
#Loop through Each Item
ForEach($RDitem in $RDitems)
{
#Do something
Write-host $RDcount"." $RDitem["Title"] "|" $RDitem["ContentType"]
foreach($RDroleAssignment in $RDitem.RoleAssignments)
{
Write-Host - $RDroleAssignment.Member.Name
}
$RDcount +=1
}