MCQ
A parallel plate capacitor has a capacity C. The separation between the plates is doubled and a dielectric medium is introduced between the plates. If the capacity now becomes 2C, the dielectric constant of the medium is
- A2
- B1
- ✓4
- D8
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| Column $I$ | Column $II$ |
| $(A)$ Point $P$ is situated midway between the wires. $Image$ | $(p)$ The magnetic fields $(B)$ at $P$ due to the currents in the wires are in the same direction. |
| $(B)$ Point $P$ is situated at the mid-point of the line joining the centers of the circular wires, which have same radii. $Image$ | $(q)$ The magnetic fields $(B)$ at $P$ due to the currents in the wires are in opposite directions. |
| $(C)$ Point $P$ is situated at the mid-point of the line joining the centers of the circular wires, which have same radii. $Image$ | $(r)$ There is no magnetic field at $P$. |
| $(D)$ Point $P$ is situated at the common center of the wires. $Image$ | $(s)$ The wires repel each other. |


