MEDIUM
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IMPORTANT
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Two concentric co-planner coils of equal turns have radii and Respectively. Same current flowing in both the coils in same direction. Now direction of current is reversed in one coil then ratio of magnetic field at their common centre in two conditions respectively :-
(a)2 : 1
(b)1 : 2
(c)1 : 1
(d)4 : 1

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Important Questions on Magnetic Effect of Current
EASY
NEET
IMPORTANT
Two concentric co-planar coils of turns and have radii ratio , respectively. Equal currents in both the coils flow in opposite directions. If net magnetic field is zero at their common centre, then is,

MEDIUM
NEET
IMPORTANT
Find out magnetic field at point ’O’ for the following current distributions.


EASY
NEET
IMPORTANT
Find out magnetic field at point for the following current distributions.

EASY
NEET
IMPORTANT
Find out magnetic field at point for the following current distributions.

MEDIUM
NEET
IMPORTANT
A conducting rod moves towards right with constant velocity in uniform transverse magnetic field. Graph between force applied by the external agent v/s velocity and power supplied by the external agent v/s velocity:

MEDIUM
NEET
IMPORTANT
If current is flowing in this system and the diameter of the loop is, then find magnetic field at point due to given current distribution.

HARD
NEET
IMPORTANT
The figure shows a circular loop with radius . The resistance of arc is and that of is . The magnetic field at the centre of the loop is,

HARD
NEET
IMPORTANT
Radius of current carrying coil is ’R’. If fractional decreases in field value with respect to centre of the coil for a near by axial point is 1% then find axial position of that point.
