Recommended PYQs (STRICTLY NCERT Based) Electromagnetic Induction 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 sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:

$\mathrm A.$	hold the sheet there if it is magnetic.
$\mathrm B.$	hold the sheet there if it is non-magnetic.
$\mathrm C.$	move the sheet away from the pole with uniform velocity if it is conducting.
$\mathrm D.$	move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar.

Choose the correct statement

(s)

$(\mathrm s )$ from the options given below:
1.

A

$\mathrm A$ and

C

$\mathrm C$ only
2.

A

$\mathrm A$ ,

C

$\mathrm C$ and

D

$\mathrm D$ only
3.

C

$\mathrm C$ only
4.

B

$\mathrm B$ and

D

$\mathrm D$ only

Subtopic: Faraday's Law & Lenz Law |

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Q2:

An ideal inductor-resistor-battery circuit is switched on at

t = 0 s

$t=0~\text{s}$ . At time

t

$t$ , the current is

i = i_{0} (1 - e^{(- \frac{t}{τ})}) A

$i=i_0\left(1-e^{\left(-\frac{t}{\tau}\right)}\right)\text{A}$ , where

i_{0}

$i_0$ is the steady-state value. The time at which the current becomes

0.5 i_{0}

$0.5i_0$ is: [Given

ln (2) = 0.693

$\text{ln}(2)= 0.693$ ]
1.

6.93 \times 10^{3} s

$6.93 \times 10^3 ~\text{s}$
2.

6.93 ms

$6.93~\text{ms}$
3.

69.3 s

$69.3~\text{s}$
4.

6.93 s

$6.93~\text{s}$

Subtopic: LR circuit |

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Q3:

A conducting circular loop of face area

2.5 \times 10^{- 3} m^{2}

$2.5 \times 10^{-3}~\text{m}^2$ is placed perpendicular to a magnetic field which varies as

B = 0.5 \sin (100 π t) T

$B=0.5\sin(100 \pi t)~\text{T}$ . The magnitude of induced emf at time

t = 0 s

$t= 0~\text{s}$ is:

1.	$0.125 \pi~ \text{mV}$	2.	$125 \pi ~\text{mV}$
3.	$125 \pi~\text{V}$	4.	$12.5 \pi~\text{mV}$

Subtopic: Faraday's Law & Lenz Law |

66%

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Q4:

A rod of length

L

$L$ rotates with a small uniform angular velocity

ω

$\omega$ about its perpendicular bisector. A uniform magnetic field

B

$\mathrm B$ exists parallel to the axis of rotation. The potential difference between the centre of the rod and an end is:
1.

\frac{B ω L^{2}}{8}

$\large\frac{B\omega L^2}{8}$
2.

\frac{B ω L^{2}}{2}

$\large\frac{B\omega L^2}{2}$
3.

\frac{B ω L^{2}}{4}

$\large\frac{B\omega L^2}{4}$
4. zero

Subtopic: Motional emf |

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Q5:

Let us consider two solenoids

A

$A$ and

B,

$B,$ made from the same magnetic material of relative permeability

μ_{r}

$\mu_{r}$ and of equal area of cross-section. Length of

A

$A$ is twice that of

B

$B$ and the number of turns per unit length in

A

$A$ is half that of

B .

$B.$ The ratio of self-inductances of the two solenoids,

L_{A} : L_{B}

$L_A:L_B$ is:
1.

1 : 2

$1:2$
2.

2 : 1

$2:1$
3.

8 : 1

$8:1$
4.

1 : 8

$1:8$

Subtopic: Self - Inductance |

63%

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Q6:

The magnetic energy stored in an inductor of inductance

4 μ H

$4~\mu\text{H}$ carrying a current of

2 A

$2~\text{A}$ is:
1.

8 μ J

$8~\mu \text{J}$
2.

4 μ J

$4~\mu \text{J}$
3.

4 mJ

$4~\text{mJ}$
4.

8 mJ

$8~\text{mJ}$

Subtopic: Self - Inductance |

74%

From NCERT

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Q7:

An emf is generated by an ac generator having

100

$100$ turn coil, of loop area

1

$1$ m². The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of

0.05

$0.05$ T perpendicular to the axis of rotation of the coil. The maximum value of emf is:
1.

3.14

$3.14$ V
2.

31.4

$31.4$ V
3.

62.8

$62.8$ V
4.

6.28

$6.28$ V

Subtopic: Motional emf |

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Q8:

A square loop of side

1 m

$1~\text m$ and resistance

1 Ω

$1~\Omega$ is placed in a magnetic field of

0.5 T .

$0.5~\text T.$ If the plane of the loop is perpendicular to the direction of the magnetic field, the magnetic flux through the loop is:
1. zero
2.

2

$2$ weber
3.

0.5

$0.5$ weber
4.

1

$1$ weber

Subtopic: Magnetic Flux |

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Q9:

A big circular coil with

1000

$1000$ turns and an average radius of

10 m

$10~\text{m}$ is rotating about its horizontal diameter at a rate of

2 {rad s}^{- 1} .

$2~\text{rad s}^{-1}.$ The vertical component of the Earth's magnetic field at that location is

2 \times 10^{- 5} T,

$2\times 10^{-5}~\text{T},$ and the electrical resistance of the coil is

12.56 Ω,

$12.56~\Omega,$ the maximum induced current in the coil will be:
1.

2 A

$2~\text{A}$
2.

0.25 A

$0.25~\text{A}$
3.

1.5 A

$1.5~\text{A}$
4.

1 A

$1~\text{A}$

Subtopic: Faraday's Law & Lenz Law |

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Q10:

The current in an inductor of self-inductance $4~\text{H}$ changes from $4~ \text{A}$ to $2~\text{A}$ in $1~ \text s$ . The emf induced in the coil is:
1. $-2~\text{V}$
2. $2~\text{V}$
3. $-4~\text{V}$
4. $8~\text{V}$

Subtopic: Self - Inductance |

83%

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