Question
How does the electric field inside a dielectric decrease when it is placed in an external electric field?
✓
Answer
When a dielectric is placed in an external electric field, the charges are induced on the faces of dielectric which produce opposite electric field in the dielectric. Thus net electric field inside the dielectric is reduced.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Light from Balmer series of hydrogen is able to eject photoelectrons from a metal. What can be the maximum work function of the metal?
Light falls from glass $(\mu=1.5)$ to air. Find the angle of incidence for which the angle of deviation is 90°.
→A point charge ' $q$ ' is placed at point $O$ as shown in the figure. Will $\left(V_A-V_B\right)$ be positive, negative or zero if $q$ is (i) positive (ii) negative.
→An optical fibre $(\mu=1.72)$ is surrounded by a glass coating $(\mu=1.50).$ Find the critical angle for total internal/ reflection at the fibre-glass interface.
→A block of mass m containing a net positive charge q is placed on a smooth horizontal table which terminates in a vertical wall as shown in figure. The distance of the block from the wall is d. A horizontal electric field E towards right is switched on. Assuming elastic collisions (if any) find the time period of the resulting oscillatory motion. Is it a simple harmonic motion?
What conclusion can you draw from the following observations on a resistor made of alloy manganin?
| Current A | Voltage V | Current A | Voltage V |
| 0.2 0.4 0.6 0.8 1.0 2.0 | 3.94 7.87 11.8 15.7 19.7 39.4 | 3.0 4.0 5.0 6.0 7.0 8.0 | 59.2 78.8 98.6 118.5 138.2 158.0 |
Find the energy equivalent of one atomic mass unit, first in Joules and then in MeV. Using this, express the mass defect of ${ }_8^{16} O$ in $MeV / c ^2$.
→A proton and an a-particle have the same de-Broglie wavelength. Determine the ratio of (i) Their accelerating potentials and (ii) Their speeds.
A charge Q is placed at the centre of a cube. Find the flux of the electric field through the six surfaces of the cube.
Explain the term ‘drift velocity’ of electrons in a conductor. Hence obtain the expression for the current through a conductor in terms of ‘drift velocity’.