When a proton is released from rest in a room, it starts with an initial acceleration ${\mathrm{a}}_{0}$ towards the east. When it is projected towards the north with a speed ${\mathrm{v}}_{0}$, it moves with initial acceleration $3{\mathrm{a}}_{0}$ towards east. The electric and magnetic fields in the room are -

1.

2.

3.

4.

Subtopic:  Lorentz Force |
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If the planes of two identical concentric coils are the perpendicular and magnetic moment of each coil is M, then the resultant magnetic moment of the two coil system is

1.  M

2.  $\sqrt{2}\mathrm{M}$

3.  3M

4.  2M

Subtopic:  Magnetic Moment |
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Which of the following graph 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 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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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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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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