Magnetic Effect...

Two parallel long wires A and B carry currents $$i_1$$ and $$i_2 ( < i_1)$$. When $$i_1$$ and $$i_2$$ are in same direction, the magnetic field at a point mid-way between the wires is $$10 \mu T$$. if $$i_2$$ is reverse the field becomes $$30\mu T$$ the ratio $$i_1 /i_2$$ is

What is the type of field line of a magnetic field passing through the centre of current carrying circular ring?

The phenomenon of electro-magnetic induction is

Magnetic field lines are __________.

Magnetic field has ________.

The field lines emerge from _______ and merge at ________.

Electricity flows through a very long solenoid. Some statements are given below related to the magnitude of the magnetic field developed inside the coil. Find out the correct ones and write them down. 

Three similar bar magnets are placed from an equilateral as shown in fig ,The magnetic moment of each magnet is M . What is the  magnitude of magnetic moment of the system ?

The direction of magnetic field in a bar magnet is

The magnetic field is strongest at