I need to simulate \'n\' number of request per minute. I am load testing 5 different webservices each of which should be simulated with different \'n\' requests per minute.
Add a Constant Throughput Timer to the Thread Group.
If you want separate value of req per minute for each web service, you can create 5 thread groups with 5 timers. Run all of them in one Test Plan
Resources:
http://www.davegardner.me.uk/blog/2010/09/23/effective-load-testing-with-apache-jmeter/#constant-throughput-timer