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Two equal balls with equal positive charge 'q' coulombs are suspended by two insulating strings of equal length. What would be the effect on the force when a plastic sheet is inserted between the two?

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A particle of mass *m *and charge (−*q*) enters the region between the two charged plates initially moving along *x*-axis with speed *vx *(like particle 1 in Fig. 1.33). The length of plate is *L *and an uniform electric field *E *is maintained between the plates. Show that the vertical deflection of the particle at the far edge of the plate is *qEL*^{2}/ (2*m`v_s^2`*).

The electrostatic force on a small sphere of charge 0.4 μC due to another small sphere of charge − 0.8 μC in air is 0.2 N. (a) What is the distance between the two spheres? (b) What is the force on the second sphere due to the first?

Check that the ratio *ke*^{2}/*G m*_{e}*m*_{p}_{ }is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio signify?

Suppose that the particle in Exercise in 1.33 is an electron projected with velocity *v*_{x}= 2.0 × 10^{6} m s^{−1}. If *E *between the plates separated by 0.5 cm is 9.1 × 10^{2} N/C, where will the electron strike the upper plate? (| *e *| =1.6 × 10^{−19} C, *m*_{e }= 9.1 × 10^{−31} kg.)

Four point charges *q*_{A }= 2 μC, *q*_{B }= −5 μC, *q*_{C} = 2 μC, and *q*_{D} = −5 μC are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 μC placed at the centre of the square?