Change set

Pick exam & year, then Go.

Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q20 (CISF/2019) Science & Technology › Basic Science (Physics, Chemistry, Biology)

The horizontal component of the earth's magnetic field is zero at

Explanation

The Earth's magnetic field at any location can be resolved into a horizontal component (BH) and a vertical component (BV). This is determined by the angle of dip (θ), which is the angle that the total magnetic field vector makes with the horizontal surface.

The horizontal component is calculated as: BH = B cos θ.

  • At the magnetic equator, the magnetic field lines are parallel to the Earth's surface, meaning the angle of dip is 0°. Thus, BH = B cos 0° = B (maximum).
  • At the magnetic poles, the magnetic field lines are perpendicular to the Earth's surface, meaning the angle of dip is 90°. Since cos 90° = 0, the horizontal component BH becomes zero.

Option C is incorrect because geographic poles do not exactly coincide with magnetic poles, where this specific physical phenomenon occurs.

✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-II · 2018 · Q29 Relevance score: 2.25

The direction of magnetic field at any location on the earth’s surface is commonly specified in terms of

NDA-I · 2017 · Q3 Relevance score: 2.25

At which place Earth’s magnetic field becomes horizontal ?

IAS · 2005 · Q91 Relevance score: 0.32

Consider the following statements: 1. The axis of the earth magnetic field is inclined at 23 to the geographic axis of the earth. 2. The earth’s magnetic pole in the northern hemisphere is located on a peninsula in northern Canada. 3. Earth’s magnetic equator passes through Thumna in South India. Which of the statements is/are correct?

NDA-I · 2025 · Q129 Relevance score: -0.11

The magnetic field inside a long straight solenoid-carrying current

NDA-I · 2013 · Q55 Relevance score: -0.45

A positively charged particle projected towards west is deflected towards north by a magnetic field. The direction of the magnetic field is