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`         How many neutral points on a horizontal board are there when a manget is held vertically on the board`
7 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear deepak,
If earth's magnetic field is considered as "B" ,then it has two  components along horizontal and vertical.But while determining null or  neutral points of a bar magnet only horizontal component of magnetic  field is taken into consideration but not vertical component of magnetic  field.
The reason Earth's magnetic field has a horizontal and vertical  component is because it is oriented at angle with regard to the bar  magnet in most places on Earth. Generally, you choose the reference  frame to be that of the plane of the lab bar magnet. Of course you can  also do it the other way and say that the lab bar magnet has a  horizontal and vertical component while Earth magnet is purely in one  direction but that makes things more complicated.   In the UK, the field lines lie about 70 degrees with regard to the  horizontal. So when you conduct an experiment to measure the Earth's  magnetic field by finding the null points between bar magnet and Earth  magnet, you are only finding the horizontal component of the Earth's  magnetic field.

We are all  IITians and here to help you in your IIT  JEE preparation.  All the best.

Sagar Singh
B.Tech IIT Delhi
sagarsingh24.iitd@gmail.com

```
7 years ago
OCEAN GODRE
40 Points
```										2
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7 years ago
smriti
19 Points
```										One only because earth`s magnetic field is  from S to N. The magnetic field of pole on the  board is radial. Therefore there can be only one point on the board where magnetic field due to the pole cancels horizontal component of earth`s magnetic field
```
4 months ago
Ayush
34 Points
```										 Dear deepak, If earth's magnetic field is considered as "B" ,then it has two components along horizontal and vertical.But while determining null or neutral points of a bar magnet only horizontal component of magnetic field is taken into consideration but not vertical component of magnetic field. The reason Earth's magnetic field has a horizontal and vertical component is because it is oriented at angle with regard to the bar magnet in most places on Earth. Generally, you choose the reference frame to be that of the plane of the lab bar magnet. Of course you can also do it the other way and say that the lab bar magnet has a horizontal and vertical component while Earth magnet is purely in one direction but that makes things more complicated. In the UK, the field lines lie about 70 degrees with regard to the horizontal. So when you conduct an experiment to measure the Earth's magnetic field by finding the null points between bar magnet and Earth magnet, you are only finding the horizontal component of the Earth's magnetic field.
```
3 months ago
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