A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be 18th to its value at the centre of the coil, is

(1) R3                       

(2)  R3

(3) 23R                     

(4) 23R

Subtopic:  Magnetic Field due to various cases |
 73%
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Which among the following options needs to be decreased to increase the sensitivity of a moving coil galvanometer?

1.  the number of turns in the coil. 2. the area of the coil.
3. the magnetic field. 4. the couple per unit twist of the suspension.

Subtopic:  Moving Coil Galvanometer |
 78%
From NCERT
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A metallic loop is placed in a magnetic field. If a current is passed through it, then

(1) The ring will feel a force of attraction

(2) The ring will feel a force of repulsion

(3) It will move to and fro about its centre of gravity

(4) None of these

Subtopic:  Current Carrying Loop: Force & Torque |
From NCERT
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A straight wire carrying a current i is turned into a circular loop. If the magnitude of the magnetic moment associated with it in M.K.S. unit is M, the length of wire will be

1. 4πiM                          2. 4πMi

3. 4πiM                        4. Mπ4i

Subtopic:  Magnetic Moment |
 77%
From NCERT
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A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field B=0.2Wb/m2. The torque acting on the coil is

                   

(a) 0.32 Nm tending to rotate the side AD out of the page

(b) 0.32 Nm tending to rotate the side AD into the page

(c) 0.0032 Nm tending to rotate the side AD out of the page

(d) 0.0032 Nm tending to rotate the side AD into the page

Subtopic:  Magnetic Moment |
 67%
From NCERT
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A current of 5 amperes is flowing in a wire of length 1.5 meters. A force of 7.5 N acts on it when it is placed in a uniform magnetic field of 2 Tesla. The angle between the magnetic field and the direction of the current is:


1. 30°                     2. 45°

3. 60°                     4. 90°

Subtopic:  Lorentz Force |
 81%
From NCERT
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The field normal to the plane of a coil of n turns and radius r which carries a current i is measured on the axis of the coil at a small distance h from the centre of the coil. This is smaller than the field at the centre by the fraction

(1) 32h2r2                       

(2) 23h2r2

(3)  32r2h2                       

(4) 23r2h2 

Subtopic:  Magnetic Field due to various cases |
 56%
From NCERT
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In a hydrogen atom, the electron makes 6.6×1015 rev/sec around the nucleus in an orbit of radius 0.528 Å. What will (A-m2) its magnetic moment be?
1. 1×10-15                     

2. 1×10-10

3. 1×10-23                      

4. 1×10-27

Subtopic:  Magnetic Moment |
 62%
From NCERT
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A proton of mass 1.67×10-27kg and charge 1.6×10-19C is projected with a speed of 2×106m/s at an angle of 60° to the X-axis. If a uniform magnetic field of 0.104 Tesla is applied along Y-axis, the path of the proton is:

1. A circle of radius = 0.2 m and time period π×10-7s

2. A circle of radius = 0.1 m and time period 2π×10-7s 

3. A helix of radius = 0.1 m and time period 2π×10-7s

4. A helix of radius = 0.2 m and time period 4π×10-7s

Subtopic:  Lorentz Force |
 61%
From NCERT
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The magnetic field at the centre of a circular coil of radius r is π times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases : in all cases the circular part has radius r and straight ones are infinitely long. For same current the B field at the centre P in cases 1, 2, 3 have the ratio

  

(a) -π2:π2 :3π4-12

(b) -π2+1:π2+1:3π4+12

(c) -π2:π2:3π4

(d) -π2-1:π2-14:3π4+12

Subtopic:  Magnetic Field due to various cases |
 62%
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