KCET 2018 | Electromagnetic Induction Question 16 | Physics

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

25 A

50 A

15 A

12.5 A

KCET 2017

MCQ (Single Correct Answer)

-0

The working of magnetic braking of trains is based on

eddy current

pulsating current

alternating current

steady current

KCET 2017

MCQ (Single Correct Answer)

-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 2 English

Zero

$=g$

$>g$

KCET 2017

MCQ (Single Correct Answer)

-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

0.8 V

6.4 V

3.2 V

1.6 V

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