Home Physics Moving Charge and Magnetism Mix A cell is connected between the points A and…
Physics Moving Charge and Magnetism Mix MCQ (Single Correct)

A cell is connected between the points A and C of a circular conductor ABCD of center O with angle AOC = 60 . If B 1 and B 2 are the magnitudes of the magnetic fields at O due to the currents in ABC and ADC respectively, the ratio B 1 /B 2 is

A
0.2
B
6
C
1
D
5

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Text Solution

Verified by Experts
The correct answer is:
C

Let be the lengths of the two parts and of the conductor and be resistance per unit length of the conductor.
The resistance of the part will be

The resistance of the part will be

Potential difference across must be equal

or or

Magnetic field at due to a current flowing in is given by

Magnetic field at due to current flowing in is given by

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