Pick out correct expression.
Es Is =
Ep Is
Ep Ip
Ep ⁄ Ip
Es Ip
By reversing the direction of current in a wire, the magnetic field produced by it
gets reversed in direction
increases in strength
decreases in strength
remains unchanged in strength and direction
In a step down transformer?
Ns / Np < 1
Ns = Np
Ns / Np > 1
Nothing can be said
The presence of magnetic field at a point can be detected by
Strong magnet
A solenoid
Compass needle
A current carrying wire
In a step up transformer?
Ns < Np
Ns > Np
Which of the following statement is right?The magnetic field lines become denser if.
Strength of current in the loop is increased.
There is more number of turns in the loop.
If less number of turns in the loop.
Both 1 and 2
At the ends, the current carrying solenoid behaves like
bar magnet with different polarities
compass needle
bar magnet with fixed polarity
current carrying coil
Device which converts mechanical energy to electrical by using principle of electromagnetic induction.
AC generator
DC motor
Transformer
Which of the following is incorrect?
