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 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 240$\mathrm{\Omega }$ allows only 4% of the main current after connecting a shunt resistance. The value of shunt resistance is :

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 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.

2.

3.

4.

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

(4) None of these

Subtopic:  Moving Coil Galvanometer |
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The magnetic dipole moment of the given loop is

1.

2.

3.

4.  $5{\mathrm{\pi R}}^{2}\mathrm{I}$

Subtopic:  Magnetic Field due to various cases |
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A positively charged particle falls vertically downwards. The horizontal component of the earth's magnetic field will deflect it towards:

(1) east

(2) west

(3) north

(4) south

Subtopic:  Lorentz Force |
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