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
Es Is =
Ep Is
Ep Ip
Ep ⁄ Ip
Es Ip
Weber / meter2 is the unit of
Magnetic field
Magnetic flux
Magnetic intensity
Magnetic force
At neutral point the resultant magnetic field is
∞
90
0
1
In a step up transformer?
Ns = Np
Ns < Np
Ns > Np
Nothing can be said
Which of the following statement is incorrect? The speed of rotation can be increased by,
increasing the strength of current
increasing the number of turns of coil
increasing the area of coil
decreasing the strength of magnetic field
In a step down transformer?
Ns / Np < 1
Ns / Np > 1
Which of the following looks like a helical spring ?
Compass needle
Solenoid
Strong magnet
Current carrying conductor
The SI unit of magnetic field is
Tesla
Nm
NA-1
N / m
Direction of induced emf can be obtained from
Lenz's law
Flemings right hand rule
Flemings left hand rule
Both 1 and 2
