9 - Electromagnetic Induction Questions Answers

two circular loops, of radii r and 2r, have currents i and i/2 flowing through them in clockwise and anti clockwise sence respectively. if their equivalent magnetic moments are Mand Mrespectively , state the relation between Mand M2.

Asked By: PRASIDDHI MEHTA 4 year ago Two Magnets of M magnetic dipole moment are placed shown in figure. What will be the intensity of magnetism at the point P shown in figure.

Asked By: BONEY HAVELIWALA 5 year ago

the resultant dipole moment is √2M  thus  the resultant magnetic  field is  μ2√2M/4πd3   (ans)

Asked By: VIRAT 6 year ago

A bar magnet of magnetic moment 'm' and moment of inerta 'I' (about an axis passing through centre of mass and perpendicular to the magnet) is turned through 900 about the axis of suspension, to be at right angle to a uniform magnetic field B and then released. What is the angular velocity of the magnetwhile passing through the direction of the field ??

Asked By: VIRAT 6 year ago

A SIMPLE ELECTRIC MOTOR HAS AN ARMATURE RESISTANCE OF 1 ohm & RUNS FROM A D.C SOURCE OF 12V . IT DRAWS A CURRENT OF 2A WHEN UNLOADED . WHEN A CERTAIN LOAD IS CONNECTED TO IT ,IT SPEED REDUCES BY 10% OF ITS INITIAL VALUE ,THE CURRENT DRAWN BY THE UNLOADED MOTOR IS??

ANS 3A

Asked By: SARIKA SHARMA 15 Day ago SIR , ISTHE FOLLOWG METH. IS CORRECT

R=1ohm , E=12V , I=2A

I=(E-e)/R => e=10 ON PUTTING D VALUES

NOW AS IT IS REDUCES BY 10% MEANS NOW e' = 9V ( 10/100 X 10 = 1 CHANGE , THUS FINAL = 10-1=9)

I= E-e'/R = ( 12-9)/ 1 = 3A (RESISTANCE IS KEPT CONST.) RESISTANCE WILL CHANGE OR NOT??

SARIKA SHARMA 15 Day ago

Asked By: SARIKA 6 year ago

yes this method is correct.

is megnatic & electric feild depend on the frame give proper illustration please?

Asked By: RISHABH GOUR 6 year agoSolved By: SARIKA

Q A SIMPLE ELECTRIC MOTOR HAS AN ARMATURE RESISTANCE OF 1 ohm  & RUNS FROM A D.C SOURCE OF 12V . IT DRAWS A CURRENT OF 2A WHEN UNLOADED . WHEN A CERTAIN LOAD IS CONNECTED TO IT ,IT SPEED REDUCES BY 10% OF ITS INITIAL VALUE ,THE CURRENT DRAWN BY THE UNLOADED MOTOR IS??

ANS 3A

Asked By: SARIKA SHARMA 6 year ago

in the previous case if north pole is brought near the mettalic ring  why the direction is reversed. we have to consider the  drn of magnetic field of magnet or not. if yes then which drn N-S or S-N.

Asked By: NIKHIL VARSHNEY 7 year ago

If observer is in the side of magnet, then in the given case form N in the ring, it will give you anticlockwise direction.

Due to this current produced magnetic field will be towards the coming magnet, and since north pole of magnet is coming towards ring so this field will oppose the motion of magnet

The south pole of a magnet is bought near a metallic ring ,the direction induced current in the ring will be?  Explain it clearly.

Asked By: NIKHIL VARSHNEY 7 year ago