Absorb Before You Solve MCQs Moving Charges and Magnetism Physics (2022) NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Given below are two statements:

Statement I:	A charged particle moving in a magnetic field experiences a force which is zero only when it moves in the direction of the field or against it.
Statement II:	Whenever a charged particle moves in a uniform magnetic field, its trajectory may be a circle, a straight line or a helix.

1.	Statement I is incorrect and 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 and Statement II is incorrect.

Subtopic: Lorentz Force |

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Q2:

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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Q3:

A particle of mass

m

$m$ and the charge

q

$q$ is observed to move with a uniform velocity

v

$v$ in a region containing a uniform magnetic field

B,

$B,$ and a uniform gravitational field

g .

$g.$ The magnetic field

B

$B$ must satisfy:
1.

B = \frac{m g}{q v}

$B = \dfrac{mg}{qv}$

2.

B \leq \frac{m g}{q v}

$B \leq \dfrac{m g}{q v}$

3.

B \geq \frac{m g}{q v}

$B \geq \dfrac{m g}{q v}$

4.

B = \frac{q v}{m g}

$B = \dfrac{qv}{mg}$

Subtopic: Lorentz Force |

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Q4:

A straight wire of mass $200~\text{g}$ and length $1.5~\text{m}$ carries a current of $2~\text{A}$ . It is suspended in mid-air by a uniform horizontal magnetic field $B$ (shown in the figure). What is the magnitude of the magnetic field?

1.	$0.65~\text{T}$	2.	$0.77~\text{T}$
3.	$0.44~\text{T}$	4.	$0.20~\text{T}$

Subtopic: Lorentz Force |

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Q5:

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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Q6:

A wire carrying a current $I_0$ oriented along the vector $\big(3\hat{i}+4\hat{j}\big)$ experiences a force per unit length of $\big(4F\hat{i}-3F\hat{j}-F\hat{k}\big).$ The magnetic field $\vec{ B}$ equals:

1. $\dfrac{F}{I_0}\left(\hat{i}+\hat{j}\right)$

2. $\dfrac{5F}{I_0}\left(\hat{i}+\hat{j}+\hat{k}\right)$

3. $\dfrac{F}{I_0}\left(\hat{i}+\hat{j}+\hat{k}\right)$

4. $\dfrac{5F}{I_0}\hat{k}$

Subtopic: Lorentz Force |

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Q7:

A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible?

a.	$E=0,~B=0$
b.	$E=0,~B\neq0$
c.	$E\neq0,~B=0$
d.	$E\neq0,~B\neq0$

Choose the correct option:

1.	(a), (b), (d)
2.	(b), (c), (a)
3.	(c), (d), (b)
4.	(a), (c), (d)

Subtopic: Lorentz Force |

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Q8:

A charged particle moves in a circular path of radius

r

$r$ in a uniform magnetic field

B,

$B,$ perpendicular to the plane of motion. The same particle is observed to move in a circular path around an infinite line charge

λ

$\lambda$ (charge/unit length), moving with the same kinetic energy as before. The charge to mass ratio of the particle is proportional to:

1.	$\lambda Br$	2.	$\dfrac{\lambda Br}{r}$
3.	$\dfrac{\lambda}{Br}$	4.	$\dfrac{\lambda}{B^2r^2}$

Subtopic: Lorentz Force |

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Q9:

Two particles of equal mass

m

$m$ and charge

q

$q$ move in a circular orbit of radius

r

$r$ under the influence of a magnetic field

B .

$B.$ The kinetic energy of the particles is proportional to (assume that the particles don't exert electrostatic forces on each other):
1.

q^{2}

$q^{2}$
2.

B^{2}

$B^{2}$
3.

r^{2}

$r^{2}$
4. All of the above

Subtopic: Lorentz Force |

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Q10:

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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