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                    

 

Concept Questions :-

Magnetic field due to various cases
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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 

(a) Re=Rp                (b) Rp=Rd

(c) Rd=Rα                 (d) Rp=Rα

Concept Questions :-

Lorentz force
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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

Concept Questions :-

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 +O~ at 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

Concept Questions :-

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

(a) 1.6×1015m/s                          (b) 6×10-16m/s

(c) 3.75×103m/s                          (d) 3.75×102m/s

Concept Questions :-

Lorentz force
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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

Concept Questions :-

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 :

(a) Its charge                        (b) Magnetic field

(c) Speed                               (d) None of these

Concept Questions :-

Lorentz force
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The magnetic field due to a straight conductor of uniform cross section of radius a and carrying a steady current is represented by

 

Concept Questions :-

Magnetic field due to various cases
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A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction

(a)  12-j^+k^                                   (c) 13(i^+j^+k^)

(b)  13(-j^+k^+i^)                               (d)  12(i^+k^)                        

 

 

Concept Questions :-

Magnetic field due to various cases
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A particle of charge q and mass m is moving along the x-axis with a velocity v and enters a region of electric field E and magnetic field B as shown in the figure below. For which figure the net force on the charge may be zero?

Concept Questions :-

Lorentz force
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