THE IUG /
PHYSB 1301
/

DEPT. OF PHYSICS

Quiz of chapter 3 /

TIME:10-min.

Choose the correct answer

1) The unit of Volt is equivalent to

a) J / b) J.C / c) J/C / d) N/C

2) a proton is accelerated from point A to point B in a uniform electric field E. If the distance between A and B is d, then is

a) Ed / b) -Ed / c) E/d / d) –E/d

3) An electron is accelerated from point A to point B in a uniform electric field E. If the distance between A and B is d, then is

a) Ed / b) -Ed / c) E/d / d) –E/d

4) Two points A and B are located in a uniform electric field directed as shown. The potential difference is

a) positive / b) negative / c) zero / d) we need more informatiom to know

5) Two points A and B are located in a uniform electric field directed as shown. The potential difference is

a) positive / b) negative / c) zero / d) we need more informatiom to know

6) An electron is released from point A to point B in the figure shown . The change in potential energy of the electron is

a) positive / b) negative / c) zero / d) we need more informatiom to know

7) The potential difference between two points is 100 V. If a charge q= 2C is transferred from one point to the other, then the magnitude of the work done is

a) 200 J / b) 100 J / c) 50 J / d) 2 J

8) The electriv potential at point P is given to be 120 V. The work required to bring a unit charge fron ¥ to P is

a) -120 J / b) 120 J / c) 120 V / d) -120 V

9) The electric potential at a point P is 8×103 V. The work required to bring a charge of -2mC from ¥ to P is

a) 16 mJ / b) -16 mJ / c) 4 mJ / d) -4 mJ

10) A conducting sphere is charged with Q. The work required to transfere a charge q from the center of the sphere to a point on the surface

a) is positive / b) is negative / c) is zero / d) depends on the radius of the sphere

11) A conducting sphere is charged with Q. The work required to transfere a charge q from the center of the sphere to a point inside the sphere is

a) positive / b) negative / c) depends on the potential difference between the two points. / d) zero

12) If 500 J of work is required to transfere a 4 C charge from one point to another, the potential difference between these two points is

a) 2000 V / b) 500 V / c) 125 V / d) depends on the path

13) In a certain region of space the electric filed is zero. The electric potential in this region is

a) constant / b) zero / c) positive / d) negartive

14) A system of two point charges q1 and q2 with distance r between them. The potential energy of the system is

a) / b) / c) / d)

15) Two point charges of 5.5 mC and -2.3 mC are 3.5 cm apart. The potential energy of this two-charges system is

a) 3.3 J / b) - 3.3 J / c) 93 J / d) -93 J

16) A system of two point charges q1 and q2. If the potential energy of the system is negative then

a) the two charges are positive. / b) the two charges are negative.
c) one charge is positive while the other is negative / d) non of them.

17) A system of two point charges q1 and q2. If the potential energy of the system is negative then:

a) the force is attractive. / b) the force is repulsive.
c) the force is not electric. / d) the force iz zero.

18) A system of two point charges q1 and q2. If the potential energy of the system is positive then:

a) the force is attractive. / b) the force is repulsive.
c) the force is not electric. / d) the force iz zero.

19) A conducting sphere is charged such that its surface has a voltage V. The potential at its center is

a) 0 / b) V / c) - V / d) pV

20) A hollow conducting sphere is charged to a potential V. The potential at its center is

a) 0 / b) V / c) -V / d) 2 V

21) A conducting sphere is charged with Q. The electric potential inside the sphere is increased if

a) its charge is increased. / b) its radius is increased.
c) its charge is decreased. / d) it is zero always.

22) Two conducting spheres with are separated by a distance large compared to their radii. The first sphere has a charge Q and the other is uncharged. If the spheres are connected by a conducting wire the net charge on the two spheres is

a) Q / b) 2Q / c) Q/2 / d) 0

23) Two conducting spheres with are separated by a distance large compared to their radii. The first sphere has a charge Q and the other is uncharged. If the spheres are connected by a conducting wire

a) The two spheres have the same charge / b) The two spheres have the same potential
c) The large sphere have the larger potential / d) The large sphere have the smaller potential

24) Two concentric spherical shells of radii a and b are charged to a total charge Q. The electric potential on the inner shell is

a) zero / b) / c) / d)

25) Two concentric spherical shells of radii a and b are charged to a total charge Q. Which of the following is correct

a) The two spheres have the same charge. / b) The outer sphere has a charge Q.
c) The inner sphere has a smaller charge. / d) the inner sphere has no charge.

26) Two concentric spherical shells of radii r and 2r are connected by a wire, as shown. If the system is charged to a total charge Q, the electric charge on the inner shell is:

a) zero / b) Q / c) Q/4 / d) Q/2

27) Two concentric spherical shells of radii r and 2r are connected by a wire, as shown. If the system is charged to a total charge Q, the electric charge on the outer shell is

a) zero / b) Q / c) Q/4 / d) Q/2

28) Two conducting spheres with are separated by a distance large compared to their radii. The first sphere has a charge Q and the other is uncharged. If the spheres are connected by a conducting wire

a) The two spheres have the same charge / b) The two spheres have the same potential
c) The large sphere have the larger charge / d) The large sphere have the smaller charge

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