A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of the magnetic field far away is :

(1) Twice the earlier value

(2) Half of the earlier value

(3) Quarter of its earlier value

(4) Unchanged

Subtopic:  Magnetic Field due to various cases |
 58%
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A wire carrying current i is shaped as shown. Section AB is a quarter circle of radius r. The magnetic field is directed :

                                                      
(a) At an angle π/4 to the plane of the paper

(b) Perpendicular to the plane of the paper and directed in to the paper

(c) Along the bisector of the angle ACB towards AB

(d) Along the bisector of the angle ACB away from AB

 

 

Subtopic:  Magnetic Field due to various cases |
 82%
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Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is- 

     

(1) μ0i/r                            
(2) Zero
(3) 4μ0i/r                             
(4) μ0i/4r

Subtopic:  Magnetic Field due to various cases |
From NCERT
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The earth’s magnetic field at a given point is 0.5×10-5Wb-m-2. This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius 5.0cm. The current required to be flown in the loop is nearly :

(1) 0.2 A                  

(2) 0.4A

(3) 4A                      

(4) 40A

Subtopic:  Magnetic Field due to various cases |
 77%
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A part of a long wire carrying a current i is bent into a circle of radius r as shown in the figure. The net magnetic field at the centre O of the circular loop is

                         

(1) μ0i4r                                

(2) μ0i2πrπ+1

(3) μ0i2r                                

(4) μ0i2πrπ-1

Subtopic:  Magnetic Field due to various cases |
 62%
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What is the magnetic field at point O in the figure?
                    

1.  μ0I4πr                                  
2.  μ0I4πr+μ0I2πr
3.  μ0I4r+μ0I4πr                        
4.  μ0I4r-μ0I4πr

Subtopic:  Magnetic Field due to various cases |
 78%
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The magnetic moment of a current (i) carrying circular coil of radius (r) and number of turns (n) varies as :

(1) 1/r2                            

(2) 1/r

(3) r                                  

(4) r2

Subtopic:  Magnetic Moment |
 69%
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If the current is flowing in the south direction along a power line, then what will be the direction of the magnetic field above the power line (neglecting the earth's field)?

1. South 2. East
3. North 4. West
Subtopic:  Magnetic Field due to various cases |
 60%
From NCERT
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For the magnetic field to be maximum due to a small element of current-carrying conductor at a point, the angle between the element and the line joining the element to the given point must be:

1. 0°                           
2. 90°
3. 180°                        
4. 45°

Subtopic:  Biot-Savart Law |
 87%
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An electron and a proton enter a magnetic field perpendicularly. Both have the same kinetic energy. Which of the following is true:

1. Trajectory of electron is less curved

2. Trajectory of proton is less curved

3. Both trajectories are equally curved

4. Both move on a straight-line path

Subtopic:  Lorentz Force |
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