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XII_Phy_New_Chap-01 _ ELECTRIC CHARGES AND FIELDS _ MCQ Test
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XII_Phy_New_Chap-01 _ ELECTRIC CHARGES AND FIELDS _ MCQ Test1. A square has a point charge of +Q at its center. Identical point charges of -q are placed at each corner of the
square. What is the net force acting on the central charge +Q?
(a) Attractive, proportional to Qq/r^2
(b) Repulsive, proportional to Qq/r^2
(C) Zero
(d) Depends on the size of the square
2. A thin, uniformly charged insulating wire ring with radius R is placed in the x-y plane. A point charge +q is
located at a distance z directly above the center of the ring. The electric flux through a closed hemispherical
surface with radius R, centered at the ring and enclosing the point charge, is:
(A) Zero
(b) Proportional to +q
(c) Proportional to +qz
(d) Depends on the charge distribution on the ring
3. An electron with charge -e and mass m is released from rest at a point where the electric potential is V. It
accelerates due to the electric field and reaches a point with a potential of zero. What is the electron's kinetic
energy at the final point?
(a) Zero
(B) Proportional to -eV
(c) Proportional to e^2V^2
(d) Depends on the initial position within the electric field
4. A short electric dipole consists of two point charges, +q and -q, separated by a distance d. The dipole is placed
at the origin of a coordinate system. The electric field strength on the positive x-axis (a distance x from the
origin) is:
(a) Proportional to +q/x^2
(B) Proportional to (q * d)/x^3
(c) Zero
(d) Depends on the orientation of the dipole
5. Two identical positive charges, Q each, are fixed a distance d apart. A third negative charge, -q, is placed a
distance x to the left of the leftmost positive charge and a distance (d-x) to the rightmost positive charge. The
net force acting on the negative charge -q due to the positive charges is maximized when:
(a) x = d/3
(B) x = d/2
(c) x = 2d/3
(d) x = d
6. A thin, uniformly charged insulating ring with radius R has total charge Q. A point charge q is placed a
distance z directly above the center of the ring. The magnitude of the electric force experienced by q due to the
ring depends on:
(a) Only Q and z
(b) Only Q and R
(c) Only z and R
(D) Q, z, and R
7. A long, straight wire carries a uniform current I. Two point charges, q1, and q2 (q1 ≠ q2), are located at the
same distance from the wire but on opposite sides. The net force acting on q1 due to the wire and q2 is:
(a) Directed towards q2
(b) Directed away from q2
(C) Zero
(d) Depends on the signs of q1 and q2
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