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Physics - Magnetic Effect of Current Questions and Answer >>

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1. A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is . [MP PMT 1995]

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2. A length L of wire carries a steady current I. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is . [NCERT 1980; AII]

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3. A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then. [IIT-JEE 1993]

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4. A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B, such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is . [IIT 1983; MP PM]

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5. The magnetic induction at any point due to a long straight wire carrying a current is . [MP PMT/PET 1998]

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