18 Questions
Why are magnetic field lines considered closed curves around a magnet?
Because the direction of field lines is from the magnet's south pole to its north pole.
What is the significance of drawing magnetic field lines around a magnet?
To represent the magnetic field around the magnet visually.
How is the direction of the magnetic field around a magnet defined?
By the direction in which a north pole of a compass needle moves inside it.
How is the relative strength of the magnetic field represented in the pattern of field lines?
By the degree of closeness of the field lines.
How can the deflection of a compass needle along a field line indicate the strength of the magnetic field?
The deflection increases as the needle moves towards the poles, showing stronger magnetic field closer to the poles.
Why do magnetic field lines not cross each other?
Because if they did, the compass needle would point towards two directions at the point of intersection, which is not possible.
What is the purpose of repeating the activity with the straight copper wire and compass needle?
To find the direction of the magnetic field produced by the electric current.
How can the direction of the magnetic field be determined using a compass needle?
By observing the direction of deflection of the north pole of the compass needle.
What change in the direction of current through the copper wire results in a reversed magnetic field direction?
From south to north.
What does the observation of the needle moving towards the west indicate about the magnetic field direction?
The magnetic field direction is reversed.
What happens to the north pole of the compass needle when the current flows from north to south?
It moves towards the east.
Describe the change in the direction of the needle when the current through the copper wire changes from south to north.
The needle moves towards the west.
How does an electric current in a rod affect its displacement in a magnetic field?
Increased current in the rod will increase its displacement in the magnetic field.
How does using a stronger horse-shoe magnet affect the displacement of rod AB?
Using a stronger horse-shoe magnet will increase the displacement of rod AB.
How does increasing the length of rod AB affect its displacement in a magnetic field?
Increasing the length of rod AB will increase its displacement in the magnetic field.
In which direction is a positively charged particle deflected if projected towards west and then deflected towards north by a magnetic field?
The magnetic field is directed upward.
What technique is used to obtain images of different body parts based on the magnetic fields inside the body?
Magnetic Resonance Imaging (MRI)
Which two main organs in the human body produce significant magnetic fields?
The heart and the brain
Learn how to draw magnetic field lines around a magnet and observe the deflection in a compass needle along these lines. Understand the pattern of magnetic field lines to visualize the magnetic field around the magnet.
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