Moving Charges and Magnetism [From NCERT] [NEET PYQs] [Difficult level: Easy]

 

Question:   From NCERT NEET 2020  [Difficult level:Easy] 

A wire of length L meter carrying a current of I ampere is bent in the form of a circle. Its magnetic moment is, 

1.  $\frac{{\mathrm{IL}}^2}{4}A-m^2$

2.  $\frac{I\times {\mathrm{\pi L}}^2}{4}A-m^2$

3.  $\frac{2{\mathrm{IL}}^2}{\pi }A-m^2$

4.  $\frac{{\mathrm{IL}}^2}{4\pi }A-m^2$

 Answer ▽ 

4.  $\frac{{\mathrm{IL}}^2}{4\pi }A-m^2$

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Question:   From NCERT NEET 2019  [Difficult level:Easy] 

Two toroids 1 and 2 have total no. of turns 200 and 100 respectively with average radii 40 cm and 20 cm respectively. If they carry the same current i, the ratio of the magnetic fields along the two loops is:

1. 1:1

2. 4:1

3. 2:1

4. 1:2

 Answer ▽ 

1. 1:1

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Question:   From NCERT NEET 2019  [Difficult level:Easy] 

A straight conductor carrying current I splits into two parts as shown in the figure. The radius of the circular loop is R. The total magnetic field at the centre P of the loop is,

1.  zero

2. $\frac{3{\mu }_{0}i}{32R},inward$

3. $\frac{3{\mu }_{0}i}{32R},outward$

4. $\frac{{\mu }_{0}i}{2R},inward$

 Answer ▽ 

1.  zero