PFY P.300 Phsyics.

PFY p.300

1.      A) The lines of  magnetic field round a straight current- carrying conductor are in the shape of circle

B) The Right-hand Grip Rule: if you grip the wire with your right hand pointing with the conventional current, your fingers curl with the magnetic field lines.

C) For a solenoid, the magnetic field is like that of a bar magnet.

D) If a coil is viewed from the one end and the current flows in an anticlockwise direction, then this end is a North pole.

E) The magnetic effect of a coil can be increased by increasing the number of turns/coils, increasing the magnetic field strength, or inserting a – core.

For the coil in the diagram, when the switch is pressed:

a)      What is the polarity of end A? -

b)      Which way will the compass point then? -