Joke Collection Website - Cold jokes - （211? A small ball with a mass of m and a charge of +q is tied by a thin light wire and placed in a horizontal and right uniform electric field, standing still as in.
（211? A small ball with a mass of m and a charge of +q is tied by a thin light wire and placed in a horizontal and right uniform electric field, standing still as in.
(1) According to the force analysis of the ball, the ball is subjected to gravity, electric field force and thin wire tension, as shown in figure
According to the equilibrium condition, there is a solution of
Fsinθ=qE
Fcosθ=mg
f = mg cos θ … ①
QE = mg tan θ … ② <
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