MCQs of Electric Charges and Electric Fields

Showing 1 to 10 out of 141 Questions
1.
An electric dipole is placed at the centre of a sphere. The flux passing through the surface of the sphere is _____
 (a) Infinity (b) Zero (c) Cannot be found (d) $\frac{2q}{{\epsilon }_{0}}$
2.
One point electric charge Q is placed at P. A closed surface is place near the point P. The electrical total flux passing through a surface of the sphere will be _____
 (a) $Q{\epsilon }_{0}$ (b) $\frac{{\epsilon }_{0}}{Q}$ (c) $\frac{Q}{{\epsilon }_{0}}$ (d) Zero
3.
The electric intensity at the mid point, between the region of two parallel metal sheets, each sheet having σ surface density and same kind of charge will be _____
 (a) $\frac{\sigma }{2{\epsilon }_{0}}$ (b) $\frac{\sigma }{{\epsilon }_{0}}$ (c) zero (d) $\frac{2{\epsilon }_{0}}{\sigma }$
4.
Charg Q is placed at the centre of a cube. Then the total flux passing through the cube = _____
 (a) $\frac{Q}{8{\epsilon }_{0}}$ (b) $\frac{Q}{6{\epsilon }_{0}}$ (c) $\frac{Q}{3{\epsilon }_{0}}$ (d) $\frac{Q}{{\epsilon }_{0}}$
5.
The dimensional formula of electrical field intensity is _____
 (a) M1L1T-1A-1 (b) M1L2T-3A-1 (c) M1L1T-3A-1 (d) M1L0T-3A-1
6.
The electric dipole moment of a HCI atom is 3.4 × 10-30 cm. The charges on both atoms are unlike and of same magnitude. Magnitude of this charge is _____ . The distance between the charges is 2Å.
 (a) 3.4 × 10-10 C (b) 3.4 × 10-20 C (c) 6.8 × 10-20 C (d) 1.7 × 10-20 C
7.
The force of repulsion between two like or point charges + 2C and + 6C is 12N, when charge q is added to both, the force of attraction between them will be 4 N, so q = _____ C.
 (a) + 4 (b) - 4 (c) + 1 (d) - 1
8.
The linear charge density on a straight wire of lenghth L is given by λ(x) = λ0 x3. The total charge on the wire will be ____ C.
 (a) $\frac{{\lambda }_{0}{L}^{4}}{4}$ (b) $\frac{{\lambda }_{0}L}{2}$ (c) ${\lambda }_{0}L$ (d) $\frac{{\lambda }_{0}{L}^{2}}{2}$
9.
The charge density of a spherical shell of radius R is represented by ρ(r) = βr2. So the total charge on the sphere would be _____
 (a) $\frac{4}{3}\pi {R}^{3}\beta$ (b) $\frac{2}{3}\pi {R}^{3}\beta$ (c) $\frac{4}{5}\pi {R}^{5}\beta$ (d) Zero
10.
The value of permittivty of vaccum is 8.85 × 10-12 C2N-1m-2 and the dielectric constant of water is 81. So the permittivity of water will be _____ C2N-1m-2.
 (a) 81 × 8.86 × 10-12 (b) 8.86 × 10-12 (c) (d)
Showing 1 to 10 out of 141 Questions