In a potentiometer wire experiment the emf of a battery in the primary circuit is 20V and its internal resistance is 5 ohms.There is a resistance box(in series with the battery and the potentiometer wire) whose resistance can be varied from 120 ohm to 170 ohm. Resistance of the potentiometer wire is 75 ohm. The following potential differences can be measured using this potentiometer:a)5Vb)6Vc)7Vd)8V

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AB is a current carrying conductor in the plane of the paper as shown in the figure below. (i) What is the direction of the magnetic field produced by it at point ‘X’? Write the statement of the rule used to find the direction of field lines. (ii) If the polarity of the battery connected to the wire is reversed, how would the direction of the magnetic field be changed? (iii) Point ‘X’ is at a distance r1 and point ‘Y’ is at a distance r2 (r1

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For minimum flux the angle between the magnetic field and normal to the surface is