A current of 5 amperes is flowing in a wire of length 1.5 meters. A force of 7.5 N acts on it when it is placed in a uniform magnetic field of 2 Tesla. The angle between the magnetic field and the direction of the current is:


1. 30°                     2. 45°

3. 60°                     4. 90°

Subtopic:  Lorentz Force |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The field normal to the plane of a coil of n turns and radius r which carries a current i is measured on the axis of the coil at a small distance h from the centre of the coil. This is smaller than the field at the centre by the fraction

(1) 32h2r2                       

(2) 23h2r2

(3)  32r2h2                       

(4) 23r2h2 

Subtopic:  Magnetic Field due to various cases |
 56%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

In a hydrogen atom, the electron makes 6.6×1015 rev/sec around the nucleus in an orbit of radius 0.528 Å. What will (A-m2) its magnetic moment be?
1. 1×10-15                     

2. 1×10-10

3. 1×10-23                      

4. 1×10-27

Subtopic:  Magnetic Moment |
 62%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A proton of mass 1.67×10-27kg and charge 1.6×10-19C is projected with a speed of 2×106m/s at an angle of 60° to the X-axis. If a uniform magnetic field of 0.104 Tesla is applied along Y-axis, the path of the proton is:

1. A circle of radius = 0.2 m and time period π×10-7s

2. A circle of radius = 0.1 m and time period 2π×10-7s 

3. A helix of radius = 0.1 m and time period 2π×10-7s

4. A helix of radius = 0.2 m and time period 4π×10-7s

Subtopic:  Lorentz Force |
 61%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The magnetic field at the centre of a circular coil of radius r is π times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases : in all cases the circular part has radius r and straight ones are infinitely long. For same current the B field at the centre P in cases 1, 2, 3 have the ratio

  

(a) -π2:π2 :3π4-12

(b) -π2+1:π2+1:3π4+12

(c) -π2:π2:3π4

(d) -π2-1:π2-14:3π4+12

Subtopic:  Magnetic Field due to various cases |
 62%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Two straight long conductors AOB and COD are perpendicular to each other and carry currents i1 and i2 . The magnitude of the magnetic induction at a point P at a distance a from the point O in a direction perpendicular to the plane ACBD is: 

1. μ02πa(i1+i2)                    2. μ02πa(i1-i2)

3. μ02πai12+i221/2                4. μ02πai1i2(i1+i2)

Subtopic:  Magnetic Field due to various cases |
 74%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The charge on a particle Y is double the charge on particle X. These two particles X and Y after being accelerated through the same potential difference enter a region of the uniform magnetic field and describe circular paths of radii R1 and R2 respectively. The ratio of the mass of X to that of Y is:

1. 2R1R22                     

2. R12R22

3.  R122R22                           

4. 2R1R2 

Subtopic:  Lorentz Force |
 58%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

In the given figure, the electron enters into the magnetic field. It deflects in ...... direction

                      

(1) + ve X direction

(2) – ve X direction

(3) + ve Y direction

(4) – ve Y direction

Subtopic:  Lorentz Force |
 65%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

If the angular momentum of an electron is J then the magnitude of the magnetic moment will be

1. eJm                           
2. eJ2m
3. ej.2m                         
4. 2meJ

Subtopic:  Magnetic Moment |
 85%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A cell is connected between the points A and C of a circular conductor ABCD of centre O with angle AOC = 60° . If B1 and B2 are the magnitudes of the magnetic fields at O due to the currents in ABC and ADC respectively, the ratio B1B2 is:

1. 0.2                             

2. 6                                    

3. 1

4. 5                    

 

Subtopic:  Magnetic Field due to various cases |
 58%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh