The figure shows a particle of charge q and mass m moving with velocity v along the x-axis enters a region of the uniform magnetic field. The minimum value of v so that the charge q is deflected by an angle 30° is

                                       

1.  2qBb - am 

2.  qBb + a2m 

3.  qBb - am 

4.  qBb2m

Subtopic:  Lorentz Force |
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An electron is traveling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be:

1.  Straight-line along the x-direction

2.  A circle in the xz-plane

3.  A circle in the yz-plane

4.  A circle in the xy-plane

 

Subtopic:  Lorentz Force |
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A closed-loop (of any shape) carrying current is lying in the x-y plane. A uniform magnetic field B is present in the region such that the loop experiences zero force :

1.  B acts along the x-axis

2.  B acts along the y-axis

3.  B acts along the z-axis

4.  B can act along any of the above direction for the net force to be zero

 

Subtopic:  Current Carrying Loop: Force & Torque |
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A galvanometer of resistance 240Ω allows only 4% of the main current after connecting a shunt resistance. The value of shunt resistance is :

1.  10Ω

2.  20Ω

3.  8Ω

4.  5Ω

Subtopic:  Conversion to Ammeter & Voltmeter |
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The dots in the figure show a magnetic field perpendicular to the plane of the paper and coming out of it. The curve ABC shows the trajectory of a particle in the plane of the paper. What is a particle?

                                        

1.  Proton

2.  Electron

3.  Neutron

4.  It cannot be predicted

Subtopic:  Lorentz Force |
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A long solenoid has 800 turns per meter length of the solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of the solenoid on its axis is:

1.  16×10-4 T

2.  8×10-4 T

3.  32×10-4 T

4.  4×10-4 T

Subtopic:  Magnetic Field due to various cases |
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The unit of reduction factor of the tangent galvanometer is 

(1) Ampere

(2) Gauss

(3) Radian

(4) None of these

Subtopic:  Moving Coil Galvanometer |
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In order to pass 10% of the main current through a moving coil galvanometer of 99 ohms, the resistance of the required shunt is :

(1) 9.9 Ω

(2) 10 Ω

(3) 11 Ω

(4) 9 Ω

Subtopic:  Conversion to Ammeter & Voltmeter |
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When a 12 Ω resistor is connected in parallel with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is :

(1) 24 Ω

(2) 36 Ω

(3) 48 Ω

(4) 60 Ω

Subtopic:  Conversion to Ammeter & Voltmeter |
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A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is :

(1) nG

(2) (n1)G

(3) Gn 

(4) G(n1)

Subtopic:  Conversion to Ammeter & Voltmeter |
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