A current-carrying closed Loop in the form of a right isosceles triangle ABC is placed in xy plane in a uniform magnetic field acting along the y-axis as shown in the figure. If the magnetic force on the arm AC is $\stackrel{\to }{F}$, then force on the arm BC and AB are respectively

(1) zero, zero

(2)

(3)

(4)

Subtopic:  Lorentz Force |
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A uniform electric field and a uniform magnetic field are acting in the same direction in a certain region. If a proton is projected in this region such that its velocity is pointed along the direction of fields, then the proton :

1.  will turn towards the left of the direction of motion

2.  will turn towards the right of the direction of motion

3.  will speed up

4.  will slow down

Subtopic:  Lorentz Force |
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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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Difficulty Level: