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Standard VIII

Physics

Electroscope

three point c...

Question

three point charges Q1 , Q2 , Q3 are placed along a line at same distance apart. if Q1 and Q2 are opposite in nature and net force on Q3 is zero . then find magnitude and nature of charge Q1.

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Three point charges $Q_{1}$ , $Q_{2}$ and $Q_{3}$ in that order are placed equally spaced along a straight line. $Q_{2}$ and $Q_{3}$ are equal in magnitude but opposite in sign. If the net force on $Q_{3}$ is zero, the value of $Q_{1}$ is :

Q. Three point charges

q_{1}, q_{2}

and

q_{3}

are taken such that when

q_{1}

and

q_{2}

are placed close together to form a single point charge, the force on

q_{3}

at distance

L

from this combination is a repulsion of

2

unit magnitude. When

q_{2}

and

q_{3}

are combined, the force on

q_{1}

, from same distance

L

is of magnitude

4

unit and is attractive. Also

q_{3}

and

q_{1}

combining exert

6

a force of magnitude

18

unit attractive on

q_{2}

from same distance

L

, Algebraic ratio of charges

q_{1}, q_{2}

and

q_{3}

is:

Q. Three point charges

- q_{1}

+ q_{2}

and

- q_{3}

are placed as shown in the figure. The x-component of force on

- q_{1}

is proportional to

Q. Three charges

- q_{1}, + q_{2}

and

- q_{3}

are placed as shown in the figure. The x-component of the force on

- q_{1}

is proportional to

Q. A charge

Q

located at a point

\to r

is in equilibrium under the combined electric field of three charges

q_{1}, q_{2}, q_{3}

. If the charges

q_{1}, q_{2}

are located at points

{\to r}_{1}

and

{\to r}_{2}

respectively, find the direction of the force on

Q

, due to

q_{3}

in terms of

q_{1}, q_{2}, {\to r}_{1} {\to r}_{2}

and

\to r

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