Magnetic field at the centre of a semicircular coil of N turns and radius r carrying current I is ______(Fill in the blank)

The magnetic field field produced at the centre of a circular coil carrying a current is 0.005T. Will the magnetic field change if both the number of turns and the current are doubled? (write yes or no)

Is the magnetic field at the centre of the current carrying circular coil parallel to the plane of the coil?

If the horizontal intensity due to the earth's magnetic field is 4 gauss at magnetic equator, then horizontal intensity of magnetic poles is _______. (Fill in the blanks.