# <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Which of the following graphs correctly represents the variation of magnetic field induction with distance due to a thin wire carrying current? 1.   2.   3.   4.

Subtopic:  Magnetic Field due to various cases |
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When an electron enters perpendicularly in a magnetic field with velocity v, time period of its revolution is T. If it enters in the same magnetic field with a velocity 2v, then its time period will be:

1.  2T

2.  4T

3.  $\frac{\mathrm{T}}{2}$

4.   T

Subtopic:  Lorentz Force |
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A positively charged particle descends vertically. In which direction will the horizontal component of the earth's magnetic field deflect ?

1. east

2. west

3. north

4. south

Subtopic:  Lorentz Force |
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What is the magnetic dipole moment of the given loop?

1.

2.

3.

4.  $5{\mathrm{\pi R}}^{2}\mathrm{I}$

Subtopic:  Magnetic Moment |
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The magnetic field at center due to the orbital motion of the electron in the hydrogen atom is :

1.  12.5 tesla

2.  5 tesla

3.  24 tesla

4.  1 tesla

Subtopic:  Magnetic Field due to various cases |
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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.

2.

3.

4.  $\frac{\mathrm{qBb}}{2\mathrm{m}}$

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 lies in the x-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-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 240 Ω allows only 4% of the main current after connecting a shunt resistance. What is the value of shunt resistance?

1.  10 $\mathrm{\Omega }$

2.  20 $\mathrm{\Omega }$

3.  8 $\mathrm{\Omega }$

4.  5 $\mathrm{\Omega }$

Subtopic:  Conversion to Ammeter & Voltmeter |
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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 a particle?

1.  Proton

2.  Electron

3.  Neutron

4.  It cannot be predicted

Subtopic:  Lorentz Force |
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