Points A and B are situated along the extended axis of 2 cm long bar magnet at a distance x and 2x cm respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be [EAMCET 1984; CPMT 1986]A) 4 : 1 exactly B) 4 : 1 approx. C) 8 : 1 exactly D) 8 : 1 approx.

Points A and B are situated along the extended axis of 2 cm long bar m

1.	Points A and B are situated along the extended axis of 2 cm long bar magnet at a distance x and 2x cm respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be [EAMCET 1984; CPMT 1986]A) 4 : 1 exactly B) 4 : 1 approx. C) 8 : 1 exactly D) 8 : 1 approx.
Answer» B PROPORTIONAL to 1/ X cube B1/B2 = (2X) cube / x cube = 8:1

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Points A and B are situated along the extended axis of 2 cm long bar magnet at a distance x and 2x cm respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be [EAMCET 1984; CPMT 1986]A) 4 : 1 exactly B) 4 : 1 approx. C) 8 : 1 exactly D) 8 : 1 approx.

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