my dear buddy..aditya....conservative force is a force where workdone in a closed loop is zero...but this a definition...and sometimes hard to comphrehend...so let us simplify it....consider a closed figure (u can consider a deformed circle but it should be closed)...suppose a particle is located in that point...name it as A...if now a conservative force like gravitational force(i will tell u later why this is a conservative force)...makes the particle move around the closed figure..i mean to say a full round is taken...and again it comes back to original point from where it started that is A ...then workdone will be zero....
now let us see why gravitation is a conservative force.....u certainly know the formula of gravitatioal potential energy difference...between two point.if not see ncert textbook gravitation chapter pg 192 lower left side eqn.no 8.24..in this equation if u put r1 and r2 as equal to same value r(since u return to same point)...then potential difference become zero..that is workdone is zero...therefore workdone in closed loop is zero by a gravitation force..n thats y it is conservative...
now if u want to use higher mathematics to determine if a force is conservative or not...the use formula( del operator cross force)....if its value comes to be zero..then force is conservative and if not then it is not conservative...
most of the central forces are conservative like gravitation and electrostatic...and elastic force...now u will ask what is central force....in short central force is one which act towards a point....along the force direction....
HOPE U LIKE IT...IF NOT ASK ME AGAIN....