Two charged objects are separated by a distance d. The first charge is larger in

Question

Two charged objects are separated by a distance d. The first charge is larger in magnitude than the second charge. a The first charge exerts a larger force or the second charge b. The second charge exerts a larger forte on the first charge. c The charges exert forces on each other equal in magnitude and opposite in direction. d The charges exert forces an each other equal in magnitude and pointing in the same direction A positive charge Q is located at the center of an imaginary Gaussian cube of sides a. The flux of the electric field through the surface of the cube is phi. A second, negative charge -Q is placed next to Q inside the cube. Which of the following statements will be true in this case? a. The net electric field on the surface the cube is equal to zero b. The electric field on the surface of the cube is perpendicular to the surface. c. The magnitude of the net electric field is constant on the entire surface of the cube d. The net flux through the surface of the cube is equal to zero e. The net flux through the surface is equal to 2 phi If a rectangular area is rotated in a uniform electric field from the position where the maximum electric flux goes through it to an orientation where only half the flux goes through it, what has been the angle of rotation? a. 45 degree b. 26.6 degree c. 90 degree d. 30 degree e. 60 degree An equipotential surface must be a parallel to the electric field al every point. b If the voltage between the plates of a plate capacitor is doubled, the capacitance capacitor a. is tripled. b. is halved c. is doubled d. quadruples. e. remains the same. A capacitor consists of a set of two parallel plates of area A separated by a distance d. The capacitor plates carry charges +Q and -Q. If the separation between the plates is doubled, the potential difference between the plates will a. double b. quadruple. c. be cut in half. d. be cut in fourth. e. not change. You are given a copper bar of dimensions 3 cm times 5 cm times 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure a. 3cm times 5 cm b. 3 cm times 8 cm. c. 5 cm times 8 cm d. Any pair of faces produces the same resistance. If a 3.0 V potential difference causes a 0.60 A current to flow through a resistor, its resistance, is a. 0.20 Ohm. b. 1.8 Ohm. c. 15 Ohm. d. 18 Ohm. e. 5.0 Ohm. f. 3.2 Ohm.

Explanation / Answer

Ans (1) F=kq1q2/r^2

the magnitude of the force is proportional to the product of the charges and inversaly prportional to the square of distance between them , and force that is exerted by the charges on each other always act along the line joining them so by newtons third law the charges exerts equal force in magnitude and opposite in direction

Ans is C

  

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