NEET Physics: Questions 686  690 of 2142
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Question number: 686
» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole
Question
wire of length L has magnetic moment M. It is bent in to semicircular arc. The new magnetic moment is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 687
» Magnetic Effects of Current and Magnetism » Magnetic Susceptibility and Permeability
Question
Which of the following statements are false about the magnetic susceptibility x _{m} of paramagnetic substance?
(1) Value of X _{m} is directly proportional to the absolute temperature of the sample
(2) X _{m} is negative at all temperature
(3) X _{m} does not depend on the temperature of the sample
(4) X _{m} is positive at all temperature
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1, 2 and 3 are correct 

b.  1 and 2 are correct 

c.  2 and 4 are correct 

d.  1 and 3 are correct 

Question number: 688
» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer
Question
What is the shape of magnet in moving coil galvanometer to make the radial magnetic field?
Choices
Choice (4)  Response  

a.  Convex cylindrical 

b.  None 

c.  Horse shoe magnet 

d.  Concave cylindrical 

Question number: 689
» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole
Question
A current of 30 A is flowing in a vertical straight wire. If the horizontal component of earth’s magnetic field is 2 x 10 ^{5} tesla then the distance of null point from wire is –
Choices
Choice (4)  Response  

a.  0.3 m 

b.  0.3 cm 

c.  0.3 mm 

d.  0.9 m 

Question number: 690
» Electromagnetic Induction & Alternating Currents » Faraday's Law
Question
The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation , where is in milliweber and t is in second. Then the magnitude of emf induced in the loop when t = 2 second is
Choices
Choice (4)  Response  

a.  19 mV 

b.  31 mV 

c.  14 mV 

d.  6 mV 
