MHT-CET 2020
1. A uniform electric field of intensity 400 N/C, exists in a certain region. How much flux will cross a given area of 10 cm² in this region, if the area vector is inclined at 60° to the direction the field?
- (A) 0.1 Nm²/C
- (B) 0.2 Nm²/C
- (C) 0.5 Nm²/C
- (D) 2 Nm²/C
2. An electron at rest is accelerated by a potential 'V1' in uniform field experiences a force 'F1'. When potential is changed to 'V2', the force experienced by the electron gets doubled. The rate of V1 to V2 is
- (A) 1 : 4
- (B) 4 : 1
- (C) 1 : 2
- (D) 2 : 1
3. A charge 'Q' μC is placed at the centre of a cube. The flux through one face and two opposite faces of the cube is respectively
- (A) Q/12ε μVm, Q/3ε μVm
- (B) Q/6ε μVm, Q/2ε μVm
- (C) Q/6ε μVm, Q/3ε μVm
- (D) Q/12ε μVm, Q/ε μVm
4. Two parallel plates separated by 'd' mm arc kept at potential difference of 'V' volt. A particle of mass 'm' and charge 'q' enters in it with some velocity. The acceleration of the particle will be
- (A) qV/dm
- (B) qd/Vm
- (C) qm/Vd
- (D) q/smV
5. Dimensions of mass in electric field and in electric dipole moment are respectively
- (A) 0, 0
- (B) 1, 1
- (C) 0, 1
- (D) 1, 0
6. A particle of mass m and charge q is placed at rest in a uniform electric field E and then released, the kinetic energy attained by the particle after moving a distance y will be
- (A) q²Ey
- (B) qEy
- (C) qE²y
- (D) qEy²
7. An electron experiences a force equal to its weight, when placed in an electric field. The intensity of the field will be
- (A) 1.7 x I0^11 N/C
- (B) 5.0 x 10^-11 N/C
- (C) 5.5 x 10^-11 N/C
- (D) 56 N/C
8. Two point charges +3 μC and -8 AC repel each other with a force of 40 N. If a charge of –5 μC is added to each of them, then force between them will become
- (A) –10N
- (B) 10N
- (C) 20N
- (D) –20N
