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 a0 towards the east. When it is projected towards the north with a speed v0, it moves with initial acceleration 3a0 towards east. The electric and magnetic fields in the room are -

1.  Ma0ewest, Ma0ev0up

2.  Ma0ewest, 2Ma0ev0down

3.  Ma0eeast, 2Ma0ev0down

4.  Ma0eeast, 2Ma0ev0up

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.  2M

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.  T2

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.  52πR2I  

2.  3πR2I  

3.  32πR2I  

4.  5πR2I

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.  2qBb - am 

2.  qBb + a2m 

3.  qBb - am 

4.  qBb2m

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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