Magnetic Effects of Current and Magnetism (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 34  38 of 155
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Question number: 34
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
A bar magnet of length 0.2 m and pole strength 5 Am is kept in a uniform magnetic induction field of strength 15 wbm ^{2} making an angle of 30° with the field. Find the c ouple acting on it.
Choices
Choice (4)  Response  

a.  9.0 Nm 

b.  7.5 Nm 

c.  2.5 Nm 

d.  5.5 Nm 

Question number: 35
» Magnetic Effects of Current and Magnetism » Magnetic Susceptibility and Permeability
Question
A magnetizing field of produces a magnetic flux density of 8π Tesla in an iron rod. The relative permeability of the rod will be,
Choices
Choice (4)  Response  

a.  10 ^{2} 

b.  10° 

c.  10 ^{4} 

d.  10 ^{1} 

Question number: 36
» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field
Question
A l m long conducting wire is lying at right angles to the magnetic field. A force of 1 kg weight is acting on it in a magnetic field of 0.98 tesla. The current flowing in it will be,
Choices
Choice (4)  Response  

a.  10 A 

b.  100 A 

c.  1A 

d.  0 

Question number: 37
» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field
Question
In the example above, after how much time, particle comes to the starting point for the first time, (mass of particle = m)
Choices
Choice (4)  Response  

a. 


b.  Never 

c.  It will leave the circular path before coming to the starting point 

d. 


Question number: 38
» Magnetic Effects of Current and Magnetism » Biot  Savart Law
Question
current of 1.0 ampere is flowing in the sides of an equilateral triangle of side 4.5 x 10 ^{2} m. Find the magnetic field at the centroid of the triangle.
(Permeability constant . )
Choices
Choice (4)  Response  

a.  2.0 x 10 ^{5} eber/m ^{2} 

b.  7.0 x 10 ^{12} weber/m ^{2} 

c.  6.0 x 10 ^{8} weber/m ^{2 } 

d.  4.0 x 10 ^{5} weber/m ^{2} 
