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Chapter 20: Problem 14

The vertical component of earth's magnetic field is zero at or the earth's magnetic field always has a vertical component except at the INCERT Exemplar] [a) Magnetic poles (b) Geographic poles (c) Every place (d) Magnetic equator

Short Answer

Expert verified
The vertical component is zero at the magnetic equator (option d).

Step by step solution

01

Understanding the Problem

The question asks about the location where the Earth's magnetic field has no vertical component. This means that the magnetic field lines are completely horizontal at that location.
02

Understanding Earth's Magnetic Field

Earth's magnetic field resembles that of a bar magnet. The magnetic poles, unlike geographic poles, are where the magnetic field lines are vertical. At the magnetic equator, these lines are horizontal.
03

Eliminating Incorrect Options

At magnetic poles (option a), the field has a strong vertical component since the lines are vertical, so (a) is incorrect. At geographic poles (option b), Earth's magnetic field isn't zero vertically. All places (option c) can't be correct since they include the poles.
04

Identifying the Correct Option

At the magnetic equator (option d), the magnetic field lines are parallel to the surface of the Earth, thus having no vertical component. This makes option (d) the correct answer.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Magnetic Poles
The magnetic poles of the Earth are one of the most important parts of understanding our planet鈥檚 magnetic field. Unlike the geographic poles, which are fixed points where the Earth's axis of rotation meets its surface, the magnetic poles are not fixed. They are the locations on Earth where the magnetic field is vertical.
  • Often thought of as similar to the ends of a bar magnet
  • They are regions where the magnetic field lines enter (on the Northern Magnetic Pole) or exit (on the Southern Magnetic Pole) the Earth鈥檚 surface
  • About 1,200 miles from geographic poles
Interestingly, the magnetic poles are constantly moving due to changes in Earth's interior. Scientists track their motion for navigational purposes. As the poles move, the magnetic compass readings change, which is crucial for accurate navigation.
Magnetic Equator
The magnetic equator is a vital part of Earth鈥檚 magnetic field system. It is an imaginary line that runs around the Earth and is equidistant from the magnetic poles.
  • At the magnetic equator, the magnetic field lines are parallel to the Earth's surface
  • This means there is no vertical component in the magnetic field here
  • Crucial for understanding how compass needles act, as they align horizontally here
Being a region of horizontal magnetic field lines, the magnetic equator helps in scientific understanding of magnetic phenomena and navigation. When you reach this area, a magnetic needle would point completely flat, which is unique compared to other locations. This makes it critical for studies related to atmospheric and space physics.
Geographic Poles
The geographic poles are the fixed points on Earth where its rotational axis intersects the planet's surface. These are different from the magnetic poles.
  • Located at 90掳 north latitude at the North Pole and 90掳 south latitude at the South Pole
  • They don't shift over time like magnetic poles do
  • Determine the axis of the Earth鈥檚 rotation, crucial for time-keeping and navigation
While the Earth's magnetic field is tilted in relation to these geographic poles, making them different from one another, the geographic poles remain a constant reference. They are essential for navigation, both today and in history, as well as for understanding Earth's movements and climatic patterns.

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Most popular questions from this chapter

Assertion-Reason type. Each of these contains two Statements: Statement 1 (Assertion), Statement II (Reason). Each of these questions also has four alternative choice, only one of which is correct. You have to select the correct choices from the codes (a), (b), (c) and (d) given below (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 correct explanation of the Assertion. (c) If Assertion is true but Reason is false. (d) If Assertion is false but the Reason is true. Assertion The earth's magnetic field undergoes a change with time. Reason The permeability of a ferro-magnetie material is depend upon the magnetic field.

If a diamagnetic subatance is brought near the north. or the south pole of a bar magnet, it is [Karmatalea CET 2009 ] [a] attracted by both the poles (b) repelled by both the poles (c) repelled by the north pole and attracted by the south pole (d) attracted by the north pole and repelled by the south pole

A long magnet is placed vertically with its \(S\)-pole resting on the table. A neutral point is obtained \(10 \mathrm{em}\) from the pole due geographie north of it. If \(H=3.2 \times 10^{-5} \mathrm{~T}\), then the pole strength of magnet is (a) \(8 \mathrm{ab}-\mathrm{A}-\mathrm{cm}^{-1}\) (b) \(16 a b-\mathrm{A}-\mathrm{cm}^{-1}\) (c) \(32 \mathrm{ab}-\mathrm{A}-\mathrm{cm}^{-1}\) (d) \(64 \mathrm{ab}-\mathrm{A}-\mathrm{cm}^{-1}\)

Needles \(N_{1}, N_{2}\) and \(N_{3}\) are made of a ferro-magnetie, a para- magnetic and a dia-magnetic substance respectively. A magnet when brought close to them will (a) attract \(N_{1}\) strongly, \(N_{2}\) weakly and repel \(N_{1}\) weakly (b) attract \(N_{1}\) strongly, but repel \(N_{1}\) and \(N_{3}\) weakly (c) attract all three of them (d) attract \(N_{1}\) and \(N_{2}\) strongly but repel \(N_{1}\)

Two short bar magnets of length \(1 \mathrm{~cm}\) each have magnetic moments \(1.20 \mathrm{Am}^{2}\) and \(1.00 \mathrm{Am}^{2}\) respectively. They are placed on a horizontal table parallel to each other with their \(N\) poles pointing towards the south. They have a common magnetic equator and are separated by a distance of \(20.0 \mathrm{~cm}\). The value of the resultant horizontal magnetic induction at the mid-point \(O\) of the line joining their centres is elose to (Horizontal component of the earth's magnetic induction is \(3.6 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2}\) ) IJEE Main 2013| (a) \(3.6 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^{2}\) (b) \(2.56 \times 10^{-4} \mathrm{~Wb} / \mathrm{m}^{2}\) (c) \(3.50 \times 10^{-4} \mathrm{~Wb} / \mathrm{m}^{2}\) (d) \(5.80 \times 10^{-4} \mathrm{~Wb} / \mathrm{m}^{2}\)
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