List of mportantt questions from magnetic effect of electric current class12
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Class 12 Physics Magnetic Effect of Current – Get here the Notes for Class 12 Physics Magnetic Effect of Current. Candidates who are ambitious to qualify the Class 12 with good score can check this article for Notes. This is possible only when you have the best CBSE Class 12 Physics study material and a smart preparation plan. To assist you with that, we are here with notes. Hope these notes will helps you understand the important topics and remember the key points for exam point of view. Below we provided the Notes of Class 12 Physics for topic Magnetic Effect of Current.
Class: 12th
Subject: Physics
Topic: Magnetic Effect of Current
Resource: Notes
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CBSE Class 12 Physics Notes: Magnetic Effect of Current
Candidates who are pursuing in Class 12 are advised to revise the notes from this post. With the help of Notes, candidates can plan their Strategy for particular weaker section of the subject and study hard. So, go ahead and check the Important Notes for Class 12 Physics Magnetic Effect of Current.
Oersted’s Experiment
A magnetic field is produced in the surrounding of any current carrying conductor.
The direction of this magnetic field can be obtained by Ampere’s swimming rule.
SI unit of magnetic field is Wm-2 or T (telsa).
The strength of magnetic field is called one tesla, if a charge of one coulomb, when moving with a velocity of 1 ms-1 along a direction perpendicular to the direction of the magnetic field experiences a force of one newton.
1 tesla (T) = 1 weber metre-2 (Wbm-2)
= 1 newton ampere-1 metre-1 (NA-1 m-1)
CGS units of magnetic field are called gauss or oersted.
1 gauss = 10-4 tesla.
Maxwell’s Cork Screw Rule
If a right handed cork screw is imagined to be rotated in such a direction that tip of the screw points in the direction of the current, then direction of rotation of thumb gives the direction of magnetic line of force.
The conventional sign for a magnetic field coming out of the plane and normal to it is a dot i.e.,
The magnetic field perpendicular to the plane in the downward action is denoted by ®.
Ampere’s Swimming Rule
If a man is swimming along the wire in the direction of current his face turned towards the needle, so that the current enters through his feet, then north pole of the magnetic needle will be deflected towards his left hand.
Magnetic Field
The space in the surrounding of a magnet or any current carrying conductor in which its magnetic influence can be experienced.
Biot Savart’s Law
The magnetic field produced by a current carrying element of length dl, carrying current I at a point separated by a distance r is given by
CBSE Class 11 Physics Notes Magnetic Effect of Current
dB = μo / 4 π Idl * r / r3
or dB = μo / 4 π Idl sin θ / r2
where, θ is the angle between the direction of the current and μo is absolute permeability of the free space.
SI unit of magnetic field is Wm-2 or (tesla) and CGS unit of magnetic field is gauss or oersted 1 gauss = 10-4tesla.
The direction of magnetic field dB is that of I dl * r .
Magnetic Field Due to a Straight Current Carrying Conductor
CBSE Class 11 Physics Notes Magnetic Effect of Current
where φ1 and φ2 are angles, which the lines joining the two ends of the conductor to the observation point make with the perpendicular from the observation point to the conductor.
For infinite length conductor and observation point is near the centre of the conductor,
B = μo / 4 π 2I / r
for infinite length conductor and observation point is near one end of the conductor,
B = μo / 4 π I / r
Magnetic Field Lines
CBSE Class 11 Physics Notes Magnetic Effect of Current
They are used to res present magnetic B field in a region.
They are closed continuous curves.
Tangent drawn at any point gives the direction of magnetic field.
They cannot interact.
Outside a magnet, they are directed from north to south pole and inside a magnet they are directed from south to north.
The magnetic field lines due to a straight current carrying conductor are concentric circles having centre at conductor and in a plane perpendicular to the conductor.
CBSE Class 11 Physics Notes Magnetic Effect of Current
The direction of magnetic field lines can be obtained by Right Hand Thumb Rule