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19 Dec 2006 09:10:44 IST

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pendulum bob question [admin]: tention in charged pendulum

Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Electricity

a pendulum bob of mass 80mg and carrying a charge of 2*10^-8 coulomb is at rest in a uniform horizontal electric field of 20kV/m.find

(a.)tension in the thread of the pendulum and

(b.)the angle it makes with the vertical.

Comments (1)

Nupur Goel

Blazing goIITian

Joined: 13 Dec 2006

Posts: 666

19 Dec 2006 13:31:02 IST

Like 0 people liked this

hey priyanka,

this problem can be solved by using the concept :

let the pendulum makes an angle

with the vertical. Resolve the components of Tension ' T ' in x-y directions..Tcos

in vertical direction and Tsin

in x direction.

Tcos

is balanced by weight mg therefore,

Tcos

= mg.....................................................(1)

Tsin

is balanced by force F,

Tsin

= F ( where F = qE ).........................................(2)

by solving both the equations u will get the values of both tension as well as

....

cheers..............

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