Recommended PYQs (STRICTLY NCERT Based) Moving Charges and Magnetism Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

A tightly wound

100

$100$ turns coil of radius

10 cm

$10~\text{cm}$ carries a current of

7 A

$7~\text A$ . The magnitude of the magnetic field at the centre of the coil is: (Take permeability of free space as

​ 4 π \times 10^{- 7 ​}

$4 \pi \times 10^{-7}$ SI units):
1.

4.4 T

$4.4~\text T$
2.

4.4 mT

$4.4~\text {mT}$
3.

44 T

$44~\text T$
4.

44 mT

$44~\text {mT}$

Subtopic: Magnetic Field due to various cases |

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Q2:

A wire carrying a current

I

$I$ along the positive

x

$x$ -axis has length

L

$L$ . It is kept in a magnetic field

\vec{B} = (2 \hat{i} + 3 \hat{j} - 4 \hat{k}) T

$\overrightarrow{B}=(2 \hat{i}+3 \hat{j}-4 \hat{k})~\text{T}$ . The magnitude of the magnetic force acting on the wire is:
1.

\sqrt{3} I L

$\sqrt{3}IL$
2.

3 I L

$3IL$
3.

\sqrt{5} I L

$\sqrt{5}IL$
4.

5 I L

$5IL$

Subtopic: Lorentz Force |

63%

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Q3:

A very long conducting wire is bent in a semi-circular shape from

A

$A$ to

B

$B$ as shown in the figure. The magnetic field at the point

P

$P$ for steady current configuration is given by:

1.	$\dfrac{\mu_0 i}{4 R}\left[1-\dfrac{2}{\pi}\right]$ pointed into the page
2.	$\dfrac{\mu_0 i}{4 R}$ pointed into the page
3.	$\dfrac{\mu_0 i}{4 R}$ pointed away from the page
4.	$\dfrac{\mu_0 i}{4 R}\left[1-\dfrac{2}{\pi}\right]$ pointed away from the page

Subtopic: Magnetic Field due to various cases |

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Q4:

A long straight wire of length

2

$2$ m and mass

250

$250$ g is suspended horizontally in a uniform horizontal magnetic field of

0.7

$0.7$ T. The amount of current flowing through the wire will be:
(

g = 9.8 {ms}^{- 2}

$g=9.8~\text{ms}^{-2}$ )
1.

2.45

$2.45$ A
2.

2.25

$2.25$ A
3.

2.75

$2.75$ A
4.

1.75

$1.75$ A

Subtopic: Lorentz Force |

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Q5:

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron:

1.	will turn towards right of direction of motion
2.	will turn towards left of direction of motion
3.	speed will decrease
4.	speed will increase

Subtopic: Lorentz Force |

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Q6:

A long solenoid of radius

1 mm

$1~\text{mm}$ has

100

$100$ turns per mm. If

1 A

$1~\text{A}$ current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:

1.	$6.28 \times 10^{-4} ~\text{T}$	2.	$6.28 \times 10^{-2}~\text{T}$
3.	$12.56 \times 10^{-2}~\text{T}$	4.	$12.56 \times 10^{-4} ~\text{T}$

Subtopic: Magnetic Field due to various cases |

65%

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NEET - 2022

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Q7:

Given below are two statements:

Statement I:	Biot-Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element $(Idl)$ of a current-carrying conductor only.
Statement II:	Biot-Savart's law is analogous to Coulomb's inverse square law of charge $q,$ with the former being related to the field produced by a scalar source, $(Idl)$ while the latter being produced by a vector source, $q.$

1.	Statement I is incorrect but Statement II is correct.
2.	Both Statement I and Statement II are correct.
3.	Both Statement I and Statement II are incorrect.
4.	Statement I is correct but Statement II is incorrect.

Subtopic: Biot-Savart Law |

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Q8:

From Ampere's circuital law, for a long straight wire of circular cross-section carrying a steady-current, the variation of the magnetic field inside and outside the region of the wire is:

1.	A linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for the outside region.
2.	Uniform and remains constant for both regions.
3.	A linearly increasing function of distance upto the boundary of the wire and then a linearly decreasing one for the outside region.
4.	A linearly increasing function of distance $r$ upto the boundary of the wire and then decreasing one with $1/r$ dependence for the outside region.

Subtopic: Ampere Circuital Law |

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Q9:

The ratio of the radii of two circular coils is $1:2.$ The ratio of currents in the respective coils such that the same magnetic moment is produced at the centre of each coil is:

1.	$4:1$	2.	$2:1$
3.	$1:2$	4.	$1:4$

Subtopic: Magnetic Moment |

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Q10:

A strong magnetic field is applied along the direction of the velocity of an electron. The electron would move along:

1.	a parabolic path
2.	the original path
3.	a helical path
4.	a circular path

Subtopic: Lorentz Force |

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