1. what will happen if compass needle in oersted experiment is kept perpendicularly to current carrying conductor, whether the needle deflects or not give the reason? 2. Is there no magnetic field in the blank spaces in magnetic field line? 3.why do the armature coil in electric motor is taken in rectangular shape not in other shape? 4.what is the difference between Alternating Current and Direct Current and also what is the need to change the D.C. and A.C. in our home appliances? 5.why the voltmeter connected parallel in the circuit and ammeter in series in the circuit?