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 |
 52%
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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 lies in the \(x\text-y\) plane. What happens when a uniform magnetic field \(B\) is present in the region such that the loop experiences zero force?
1. \(B\) acts along the \(x\text-\)axis
2. \(B\) acts along the \(y\text-\)axis
3. \(B\) acts along the \(z\text-\)axis
4. \(B\) can act along any of the above direction for the net force to be zero
Subtopic:  Current Carrying Loop: Force & Torque |
 55%
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A galvanometer of resistance \(240~\Omega\) allows only \(4\%\) of the main current after connecting a shunt resistance. What is the value of shunt resistance?
1. \(10~\Omega\)
2. \(20~\Omega\)
3. \(8~\Omega\)
4. \(5~\Omega\)

Subtopic:  Conversion to Ammeter & Voltmeter |
 75%
From NCERT
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The dots in the figure depict a magnetic field that is perpendicular to the plane of the paper and emanates from it. The trajectory of a particle in the plane of the paper is depicted by the curve \(ABC\). What exactly is the particle?

                            

1. Proton. 2. Electron.
3. Neutron. 4. It cannot be predicted.
Subtopic:  Lorentz Force |
 59%
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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 |
 58%
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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 |
PMT - 1987
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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 |
 77%
From NCERT
PMT - 1994
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When a \(12~\Omega\) resistor is connected in parallel with a moving coil galvanometer, its deflection reduces from \(50\) divisions to \(10\) divisions. What will be the resistance of the galvanometer?
1. \(24~\Omega\)
2. \(36~\Omega\)
3. \(48~\Omega\)
4. \(60~\Omega\)

Subtopic:  Conversion to Ammeter & Voltmeter |
 69%
From NCERT
PMT - 2002
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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 |
 76%
From NCERT
PMT - 1999
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