Magnetic Effects of Current and MagnetismBar Magnet (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 22  25 of 27
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Question number: 22
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P which gets deflected through an angle 0 under the influence of magnets. The ratio of distances d _{1} and d _{2} will be
Choices
Choice (4)  Response  

a.  (2 cot θ) ^{1/3} 

b.  (2 tan θ) ^{1/3} 

c.  (2 cot θ) ^{1/3} 

d.  (2 tan θ) ^{1/3} 

Question number: 23
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
A 10 cm long bar magnet of magnetic moment 1.34 Am ^{2 } is placed in the magnetic meridian with its south pole pointing geographical south. The neutral point is obtained at a distance of 15 cm from the center of the magnet. Calculate the horizontal component of earth’s magnetic field.
Choices
Choice (4)  Response  

a.  0.21 x 10 ^{4} T 

b.  0.12 x 10 ^{4 } T 

c.  0.87 x 10 ^{7} T 

d.  0.34 x 10 ^{4} T 

Question number: 24
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
Calculate magnetic induction at a distance of 20 cm from a pole of strength 40 Am in air.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 25
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
A magnet of moment M is lying in a magnetic field of induction B. W _{1} is the work done in turning it from 0° to 60° and W _{2} is the work done in turning it from 30° to 90°.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

