Correct answer: north-south directions
Explanation:
A compass needle is a small magnet, and when it is freely suspended, it aligns itself with the Earth's magnetic field.
The Earth acts like a giant magnet with its magnetic south near the geographic North Pole and magnetic north near the geographic South Pole.
Thus, the compass needle aligns itself along the geographic north-south direction, with the north pole of the needle pointing towards the geographic north.
Hence, the correct answer is: north-south directions.
Two large plane parallel conducting plates are kept 10 cm apart as shown in figure. The potential difference between them is $ V $. The potential difference between the points A and B (shown in the figure) is: 
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Net dipole moment of a polar linear isotropic dielectric substance is not zero even in the absence of an external electric field. Reason
(R): In absence of an external electric field, the different permanent dipoles of a polar dielectric substance are oriented in random directions.
In the light of the above statements, choose the most appropriate answer from the options given below:
A metallic ring is uniformly charged as shown in the figure. AC and BD are two mutually perpendicular diameters. Electric field due to arc AB to O is ‘E’ magnitude. What would be the magnitude of electric field at ‘O’ due to arc ABC? 