The bob of a pendulum has mass 
kg and charge 
. Length of pendulum is 
. The point of suspension also has the same charge 40 
. What the minimum speed u should be imparted to the bob so that it can complete vertical circle?
A
6 
B
2 
C
8 
D
4 
Text Solution
Verified by ExpertsThe correct answer is:
A
Force of repulsion between the charges:
Since 
, so string always remains tight at any position even if velocity of bob is zero. So minimum speed at lowest point will be such that it is sufficient to take particle to highest point, i.e., velocity becomes zero at highest point. For this
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
An electron moving with the speed per sec is shot parallel to the electric field of intensity . …
Electric charge is uniformly distributed along a along straight wire of radius 1 mm. The charge per…
A charge q is enclosed by an imaginary Gaussian surface.
If radius of surface is increasing at a r…
What is the electric flux linked with closed surface?
If aspherical conductor comes out from the closed surface of the sphere then total flux emitted fro…
Consider the charge configuration and spherical Gaussian surface as shown in the figure. When calcu…