Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Class 12 Physics 35 Years JEE Mains &Advance Past year Paper

Created by: Abhishek Kapoor

JEE : Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

The document Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev is a part of the JEE Course Class 12 Physics 35 Years JEE Mains &Advance Past year Paper.
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Q.1. A neutron, a proton, and an electron and an alpha particle enter a region of constant magnetic field with equal velocities.The magnetic field is along the inward normal to the plane of the paper. The tracks of the particles are labelled in fig.The electron follows track ...... and the alpha particle follows track .....

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Ans. D, B

Solution. According to Fleming's left hand rule, the force on electrons will be towards right (D).

Also, by the same rule we find that the force on proton and a-particle is towards left. Now since the magnetic force will behave as centripetal force, therefore

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

∴ radius will be more for α-particle

∴α-particle will take path B.

Q.2. A wire of length L metre, carrying a current i ampere is bent in the form of a circle. The magnitude of its magnetic moment is ........in MKS units.

Ans. Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Solution. 

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Wire of length L is bent in the form of a circle. Then the perimeter of the circle

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Magnetic moment of a loop in which current i flows is given by

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Q.3. In a hydrogen atom, the electron moves in an orbit of radius 0.5 Å making 1016 revolutions per second. The magnetic moment associated with the orbital motion of the electron is ......

Ans. 1.25 × 10–23 Am2

Solution.

 Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Q.4. The wire loop PQRSP formed by joining two semicircular wires of radii R1 and R2 carries a current I as shown. The magnitude of the magnetic induction at the centre C is ....................

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Ans. Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Solution. The magnetic field at C due to current in PQ and RS is zero. Magnetic field due to current in semi-circular arc QAR

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

directed towards reader perpendicular to the plane of paper.


Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Magnetic field due to current in semi-circular arc

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

directed away from reader perpendicular to the plane of paper.

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

(directed towards the reader perpendicular to plane of paper).

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Q.5. A wire ABCDEF (with each side of length L) bent as shown in figure and carrying a current I is placed in a uniform magnetic induction B parallel to the positive y-direction.

The force experienced by the wire is ............ in the ............. direction.

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Ans. IlB; +Z direction

Solution. We may assume current to be flowing in segment EB in both directions.

Net force on the loop EDCBE will be zero. Also force due to segment FE and BA will be zero. Force due to segment EB

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Q.6. A metallic block carrying current I is subjected to a uniform magnetic induction Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev shown in Figure .

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

The moving charges experience a force Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev given by .... which results in the lowering of the potential of the face .... Assume the speed of the carriers to be v.

Ans. evB; ABCD

Solution. Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

NOTE : The direction of flow of electrons is opposite to that of current.

Q.7. No net force acts on a rectangular coil carrying a steady current when suspended freely in a uniform magnetic field.

Ans. T

Solution. A current carrying coil is a magnetic dipole. The net force on a magnetic dipole placed in uniform magnetic field is zero.

Q.8.There is no change in the energy of a  charged particle moving in a magnetic field although a magnetic force is acting on it.

Ans. T

Solution. 

NOTE : The magnetic force acts in a direction perpendicular to the direction of velocity and hence it cannot change the speed of the charged particle. Therefore, the kinetic energy Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRevdoes not change.

Q.9. A charged particle enters a region of uniform magnetic field at an angle  of 85° to the magnetic line of force . The path of the particle is a circle.

Ans. F

Solution. The velocity component vwill be responsible in moving the charged particle in a circle.

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

The velocity component v1 will be responsible in moving the charged particle in horizontal direction. Therefore the charged particle will travel in a helical path.

Q.10. An electron and a proton are moving with the same kinetic energy along the same direction. When they pass through a uniform magnetic field perpendicular to the direction of their motion, they describe circular paths of the same radius.

Ans. F

Solution. When a charged particle passes through a uniform magnetic field perpendicular to the direction of motion, a force acts on the particle perpendicular to the velocity. This force acts as a centripetal force

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Here, q is same for electron and proton

Fill Ups, True/False of Moving Charges and Magnetism, Past year Questions JEE Advance, Class 12, JEE Notes | EduRev

Radius of proton will be more.





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