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%
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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%
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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%
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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%
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An electron, a proton, a deuteron and an alpha particle, each having the same speed are in a region of constant magnetic field perpendicular to the direction of the velocities of the particles. The radius of the circular orbits of these particles are respectively Re, RpRd and Rα. It follows that 

(1) Re=Rp               

(2) Rp=Rd

(3) Rd=Rα                 

(4) Rp=Rα

Subtopic:  Lorentz Force |
 66%
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An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR. The magnetic field due to this current at the point M is H1. Now another infinitely long straight conductor QS is connected at Q so that the current is I/2 in QR as well as in QS, The current in PQ remaining unchanged. The magnetic field at M is now H2The ratio H1/H2 is given by

(a) 12                                                

(b)  1

(c)  23

(d)  2

Subtopic:  Magnetic Field due to various cases |
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A very long straight wire carries a current I. At the instant when a charge +Qat point P has velocity v , as shown, the force on the charge is:

1. Opposite to OX                            
2. Along OX
3. Opposite to OY                             
4. Along OY

Subtopic:  Lorentz Force |
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An electric field of 1500 V / m and a magnetic field of 0.40 weber / meter2 act on a moving electron. The minimum uniform speed along a straight line the electron could have is

(1) 1.6×1015m/s                         

(2) 6×10-16m/s

(3) 3.75×103m/s                         

(4) 3.75×102m/s

Subtopic:  Lorentz Force |
 82%
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A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is:

1. μ0NIb                                  2. 2μ0NIa

3. μ0NI2(b-a)lnba                         4. μ0IN2(b-a)lnba

Subtopic:  Magnetic Field due to various cases |
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An electron, moving in a uniform magnetic field of induction of intensity B, has its radius directly proportional to :

(1) Its charge                       

(2) Magnetic field

(3) Speed                               

(4) None of these

Subtopic:  Lorentz Force |
 84%
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