1
KCET 2018
MCQ (Single Correct Answer)
+1
-0
A step-up transformer operates on a 230 V "ne and a load current of 2 A . The ratio of primary and secondary windings is $1: 25$. Then, the current in the primary is
A
25 A
B
50 A
C
15 A
D
12.5 A
2
KCET 2017
MCQ (Single Correct Answer)
+1
-0
The working of magnetic braking of trains is based on
A
eddy current
B
pulsating current
C
alternating current
D
steady current
3
KCET 2017
MCQ (Single Correct Answer)
+1
-0

A bar magnet is allowed to fall vertically through a copper coil placed in a horizontal plane. The magnet falls with a net acceleration, is

KCET 2017 Physics - Electromagnetic Induction Question 1 English

A
Zero
B
$=g$
C
$
D
$>g$
4
KCET 2017
MCQ (Single Correct Answer)
+1
-0
A jet plane of wing span 20 m is travelling towards west at a speed of $400 \mathrm{~ms}^{-1}$. If the earth's total magnetic field is $4 \times 10^{-4} \mathrm{~T}$ and the dip angle is $30^{\circ}$, at that place, then the voltage differences developed across the ends of the wing is
A
0.8 V
B
6.4 V
C
3.2 V
D
1.6 V
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