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

Concept Questions :-

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.

Concept Questions :-

Lorentz force
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1.  In a circle

2.  In y-z plane

3.  With constant speed

4.  All of these are correct

Concept Questions :-

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

Concept Questions :-

Magnetic moment
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A voltage has a resistance G and it can measure a maximum voltage of V. To convert it in a voltmeter of range nV, the value of resistance required is :

1.  (n - 1)G in series

2.  (n - 1)G in parallel

3.   in parallel

4.   in series

Concept Questions :-

Conversion to ammeter and voltmeter
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A current wire is hidden in a wall. Its position can be located with the help of a

1.  Moving coil galvanometer

2.  Voltmeter

3.  Hotwire ammeter

4.  Magnetic needle

Concept Questions :-

Magnetic field due to various cases
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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.

Concept Questions :-

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

Concept Questions :-

Lorentz force
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1.  R

2.  2R

3.  3R

4.  $\frac{\mathrm{R}}{2}$

Concept Questions :-

Magnetic field due to various cases
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When positively charged particle falling vertically downward, then the particle deflected due to earth magnetic field towards

(1) east

(2) west

(3) north

(4) south

Concept Questions :-

Lorentz force
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Difficulty Level: