TG EAPCET 2024 (Online) 9th May Morning Shift | Electromagnetic Induction Question 5 | Physics

Two circular coils of radii $r_1$ and $r_2\left(r_1 \ll r_2\right)$ are placed coaxially with their centres coinciding. The mutual inductance of the arrangement is

$\frac{\mu_0 \pi \pi_2^2}{2 r_1}$

$\frac{\mu_0 \pi r_1 r_2}{2\left(r_1+r_2\right)}$

$\frac{\mu_0 \pi r_1^2}{2 r_2}$

$\frac{\mu_0 \pi\left(r_1+r_2\right)}{2 r_1 r_2}$

TS EAMCET 2023 (Online) 12th May Evening Shift

MCQ (Single Correct Answer)

-0

If the vertical component of earth's magnetic field is $0.5 \times 10^{-4} \mathrm{~T}$ at a point. When an aeroplane of wing span 4 m is moving horizontally at this place at $360 \mathrm{kmh}^{-1}$, then the motional emf forced across the ends of the wings is

$20 \times 10^{-4} \mathrm{~V}$

$20 \times 10^{-2} \mathrm{~V}$

$20 \times 10^{-3} \mathrm{~V}$

$2 \times 10^{-4} \mathrm{~V}$

TS EAMCET 2023 (Online) 12th May Evening Shift

MCQ (Single Correct Answer)

-0

A boy is playing with the empty rim of a cycle wheel of radius 40 cm by rolling it along a horizontal road towards north with angular speed of $20 \mathrm{rad} \mathrm{s}^{-1}$. Considering the effect of magnetic field of earth, the e.m.f induced in the rim is

(Horizontal component of earth's magnetic field $=0.26 \mathrm{G}$ )

zero

$2 \mu \mathrm{~V}$

2.4 mV

3 V

TS EAMCET 2023 (Online) 12th May Morning Shift

MCQ (Single Correct Answer)

-0

When a current $i$ through a solenoid is increasing at a constant rate, then the induced current is

constant and it will be in the direction of $i$

constant and it will be in a direction opposite to the $i$

increased with time and it will be in the direction of $i$

increased with time and opposite to the direction of $i$

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