1
KCET 2018
MCQ (Single Correct Answer)
+1
-0
A cyclotron's oscillator frequency is 10 MHz and the operating magnetic field is 0.66 T . If the radius of its dees is 60 cm , then the kinetic energy of the proton beam produced by the accelerator is
A
9 MeV
B
10 MeV
C
7 MeV
D
11 MeV
2
KCET 2017
MCQ (Single Correct Answer)
+1
-0
A proton, a deuteron and an $\alpha$-particle are projected perpendicular to the direction of a uniform magnetic field with same kinetic energy. The ratio of the radii of the circular paths described by them is
A
$1: \sqrt{2}: 1$
B
$1: \sqrt{2}: \sqrt{2}$
C
$\sqrt{2}: \sqrt{2}: 1$
D
$\sqrt{2}: 1: 1$
3
KCET 2017
MCQ (Single Correct Answer)
+1
-0
A magnetic dipole of magnetic moment $6 \times 10^{-2}$ A-m ${ }^2$ and moment of inertia $12 \times 10^{-6} \mathrm{~kg}-\mathrm{m}^2$ performs oscillations in a magnetic field of $2 \times 10^{-2} \mathrm{~T}$. The time taken by the dipole to complete 20 oscillations is ( $\pi \approx 3$ )
A
18 s
B
6 s
C
36 s
D
12 s
4
KCET 2017
MCQ (Single Correct Answer)
+1
-0

A straight wire of length 50 cm carrying a current of 2.5 A is suspended in mid-air by a uniform magnetic field of 0.5 T (as shown in figure). The mass of the wire is ( $g=10 \mathrm{~ms}^{-2}$ )

KCET 2017 Physics - Moving Charges and Magnetism Question 1 English
A
250 gm
B
125 gm
C
62.5 gm
D
100 gm
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