Related InterviewSolutions

• An electric dipole is placed in a uniform electric field `vec(E )` of magnitude `40N//C`. Graph shows the magnitude of the square on the dipole versus the angle `theta` between the field `vec(E )` and the dipole moment `vec(p)`. The magnitude of dipole moment `vec(p)` is equal to: A. `1.25xx10^(-28)C-m`B. `2.0xx10^(-25)C-m`C. `2.5xx10^(-28)C-m`D. `5.0xx10^(-28)C-m`
• Assertion: If bob of a simple pendulum is kept in a horizontal electric field, its period of oscillation will remain same. Reason: If bob is charged and kept in horizontal electric field, then the time period will be decreased.A. if both Assertion and Reason are true and the Reason is correct explanation of the Assertion.B. If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.C. if Assertion is true, but the Reason is false.D. if both Assertion and Reason are false
• Assertion: If there exists coulombic attracation between two bodies both of them may not be charged. Reason: In coulombic attraction two bodies are oppositely charged.A. if both Assertion and Reason are true and the Reason is correct explanation of the Assertion.B. If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.C. if Assertion is true, but the Reason is false.D. if both Assertion and Reason are false
• Two charged particles of charge `+2q` and `+q` have masses `m` and `2m` respectively. Then are kept in uniform electric field allowed to move for the same time. Find the ratio of their kinetic energies.A. `1:8`B. `16:1`C. `2:1`D. `3:1`
• Charge `+2Q` and `-Q` are placed as shown in figure. The point at which electric field intensit is zero will be A. somewhere between `-Q` and `+2Q`B. somewhere on the left of `-Q`C. somewhere on the right of `+2Q`D. somewhere on the right bisector of line joining `-Q` and `+2Q`
• Suppose we have large number of identical particles, very small in size. Any of them at `10 cm` separation repel with a force of `3xx10^(-10) N`. If one of them is at `10 cm` from a group of `n` others, how strongly do you expect it to be repelled?A. `3xx10^(-10) N`B. `3nxx10^(-10)N`C. `(3xx10^(-10))/(n)N`D. Can not be calculated
• Two ideantical point charges are placed at a separation of `d`. `P` is a point on the line joining the charges, at a distance `x` from any one charge. The field at `P` is `E, E` is plotted against `x` for value of `x` from close to zero to slightly less then `d`. Which of the following represents the resulting curveA. B. C. D.
• Assertion: A line of force has sudden breaks. Reason: An electrostatic line of force is a continuous curve.A. if both Assertion and Reason are true and the Reason is correct explanation of the Assertion.B. If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.C. if Assertion is true, but the Reason is false.D. if both Assertion and Reason are false
• A point charge `Q` is placed at the centre of a circular wire of radius `R` having charge `q`. Find the force of electrostatic interaction between point charge and the wire. A. `(qQ)/(4piepsilon_(0)R^(2))`B. zeroC. `(q^(2))/(4pi epsilon_(0)R`D. none of these
• A charged particle of mass `m` and charge `q` is released from rest in an electric field of constant magnitude `E`. The kinetic energy of the particle after time `t` isA. `(2E^(2)t^(2))/(mq)`B. `(E^(2)q^(2)t^(2))/(2m)`C. `(Eq^(2)m)/(2t^(2))`D. `(Eqm)/(2t)`