A neutron of mass m enters a uniform magnetic field B with the velocity v perpendicular to it. The radius of the circular path made by a neutron is :

1.  mvB  

2.  mvB2  

3.  Infinity   

4.  Zero

Concept Questions :-

Lorentz force
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Two similar coils of radius R are lying concentrically with their planes at right angles to each other. The currents flowing in them are 3I and 4I respectively. The resultant magnetic field induction at the center is :

1.  μ0Iπ 

2.  5μ0I2R 

3.  7μ0I2R 

4.   Zero

Concept Questions :-

Magnetic field due to various cases
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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 F, then force on the arm BC and AB are respectively

(1) zero, zero

(2) -F and zero

(3) F and -F

(4) F and zero

Concept Questions :-

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

 

Concept Questions :-

Lorentz force
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A positively charged particle enters a magnetic field of Bi^ with a velocity Vj^.The particle will move

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.  2M

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.  Gn - 1 in parallel

4.  Gn - 1 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.  T2

4.   T

Concept Questions :-

Lorentz force
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