Most Important Selected Qs for JEE AdvancedPhysicsWork, Power and Energy
A particle having mass m and positive charge q whirls along vertical circle of radius R . At the centre of circle, another positive charge 2 q is fixed.
Options
- AThe minimum velocity given at the lowest point to complete vertical circular motion is less than 5 g R for mot
- BFor any value of velocity given in horizontal direction at the lowest point in gravity free space it will perf
- CTension in gravity free space cannot becomes zero at any point during motion.
- DIf the charge at the centre is removed and considering the motion in gravity tension will also be function of
Correct answer
C. Tension in gravity free space cannot becomes zero at any point during motion.
Step-by-step solution
mg - 2 kq ^2 R ^2 + T = mv ^2 R ....(i) -m g R+ 1 2 m u^2=m g R+ 1 2 m v^2 ....(ii) if T =0 u _ = 5 gR - 2 Kq ^2 mR