Two infinite straight wires $A & B, 1 m$ apart are carrying currents of $I$ and $4 I$ respectively. The distance of the points at which the resultant force is zero is

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Important Questions on Magnetic Effect of Current

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Magnetic Effect of Current>COMEDK UGET 2015>Q 1

The graph showing the variation of the magnetic field strength (B) with distance (r) from a long current carrying conductor is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Magnetic Effect of Current>COMEDK UGET 2015>Q 1

A certain length of insulated wire can be bent to form either a single circular loop (case I) or a double loop of smaller radius (case II). When the same steady current is passed through the wire, the ratio of the magnetic field at the centre in case I to that in case II is