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#	Question	Subject and topic	Difficulty
4921	According to the Biot-Savart law, the field due to a current element is zero at points:	Physics Biot-Savart law	Medium
4922	The SI unit of magnetic field B is:	Physics Biot-Savart law	Easy
4923	The radius of a current loop is doubled while the current is kept the same. The magnetic field at its centre:	Physics Biot-Savart law	Hard
4924	A long straight wire carries a current of 10 A. The magnetic field 5 cm from it is:	Physics Ampere’s law	Easy
4925	A long solenoid has 1000 turns per metre and carries 2 A. The field inside it is about:	Physics Ampere’s law	Medium
4926	The magnetic field just outside a long ideal solenoid is:	Physics Ampere’s law	Easy
4927	The field lines around a long straight current-carrying wire are:	Physics Ampere’s law	Medium
4928	The magnetic field at distance r from a long straight wire is B. At distance 3r the field is:	Physics Ampere’s law	Hard
4929	A proton moving at 2 × 10⁶ m/s enters a 0.5 T field at right angles. The magnetic force on it is:	Physics Force on moving charges and conductors	Easy
4930	Two long parallel wires 0.1 m apart each carry 10 A in the same direction. The force per metre between them i…	Physics Force on moving charges and conductors	Medium
4931	A straight wire 0.5 m long carries 3 A at right angles to a uniform field of 0.4 T. The force on the wire is:	Physics Force on moving charges and conductors	Easy
4932	The work done by a magnetic field on a moving charged particle is:	Physics Force on moving charges and conductors	Medium
4933	A charged particle moves in a circle in a uniform magnetic field. If its speed is doubled, its time period of…	Physics Force on moving charges and conductors	Hard
4934	A coil of 50 turns, each of area 0.01 m², carries 2 A. Its magnetic dipole moment is:	Physics Current loop as a magnetic dipole	Easy
4935	A galvanometer of resistance 20 Ω gives full-scale deflection at 5 mA. The shunt needed to convert it into a …	Physics Current loop as a magnetic dipole	Medium
4936	The same galvanometer (20 Ω, 5 mA full scale) is to be made into a 0–10 V voltmeter. The resistance to be con…	Physics Current loop as a magnetic dipole	Medium
4937	A radial magnetic field is used in a moving coil galvanometer so that:	Physics Current loop as a magnetic dipole	Easy
4938	A current loop is placed in a uniform magnetic field. The torque on it is maximum when:	Physics Current loop as a magnetic dipole	Hard
4939	A bar magnet of moment 2 A m² is placed at 30° to a uniform field of 0.3 T. The torque on it is:	Physics Bar magnet and magnetic materials	Easy
4940	Which of the following is diamagnetic?	Physics Bar magnet and magnetic materials	Easy