1
KCET 2024
MCQ (Single Correct Answer)
+1
-0

The magnetic field at the centre of a circular coil of radius $R$ carrying current $I$ is 64 times the magnetic field at a distance $x$ on its axis from the centre of the coil. Then, the value of $x$ is

A
$\frac{R}{4} \sqrt{15}$
B
$R \sqrt{3}$
C
$\frac{R}{4}$
D
$R \sqrt{15}$
2
KCET 2024
MCQ (Single Correct Answer)
+1
-0

A uniform magnetic field of strength $B=2 \mathrm{mT}$ exists vertically downwards. These magnetic field lines pass through a closed surface as shown in the figure. The closed surface consists of a hemisphere $S_1$, a right circular cone $S_2$ and a circular surface $S_3$. The magnetic flux through $S_1$ and $S_2$ are respectively.

KCET 2024 Physics - Moving Charges and Magnetism Question 14 English

A
$\Phi_{S_1}=-20 \mu \mathrm{~Wb}, \Phi_{S_2}=+20 \mu \mathrm{~Wb}$
B
$\Phi_{S_1}=+20 \mu \mathrm{~Wb}, \Phi_{S_2}=-20 \mu \mathrm{~Wb}$
C
$\Phi_{S_1}=-40 \mu \mathrm{~Wb}, \Phi_{S_2}=+40 \mu \mathrm{~Wb}$
D
$\Phi_{S_1}=+40 \mu \mathrm{~Wb}, \Phi_{S_2}=-40 \mu \mathrm{~Wb}$
3
KCET 2023
MCQ (Single Correct Answer)
+1
-0

A charged particle is subjected to acceleration in a cyclotron as shown. The charged particle undergoes increase in its speed

KCET 2023 Physics - Moving Charges and Magnetism Question 41 English

A
Only in the gap between $$D_1$$ and $$D_2$$
B
Only inside $$D_2$$
C
Inside $$D_1, D_2$$ and the gaps
D
Only inside $$D_1$$
4
KCET 2023
MCQ (Single Correct Answer)
+1
-0

A positively charged particle $$q$$ of mass $m$ is passed through a velocity selector. It moves horizontally rightward without deviation along the line $$y=\frac{2 m v}{q B}$$ with a speed $$v$$. The electric field is vertically downwards and magnetic field is into the plane of paper. Now, the electric field is switched off at $$t=0$$. The angular momentum of the charged particle about origin $$O$$ at $$t=\frac{\pi m}{q B}$$ is

KCET 2023 Physics - Moving Charges and Magnetism Question 44 English

A
$$\frac{4m^2 E^2}{q B^3}$$
B
$$\frac{2 m E^2}{9 B^3}$$
C
Zero
D
$$\frac{m E^3}{q B^2}$$
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