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197 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
61	In a meter bridge, a 6 Ω resistor is in the right gap and the unknown resistance in the left gap. The null po…	Physics Kirchhoff’s rules and the Wheatstone bridge	Medium
62	At balance, the condition of a Wheatstone bridge does NOT depend on:	Physics Kirchhoff’s rules and the Wheatstone bridge	Hard
63	Oersted’s experiment first showed that:	Physics Biot-Savart law	Easy
64	A circular loop of radius 0.1 m carries a current of 5 A. The magnetic field at its centre is about:	Physics Biot-Savart law	Medium
65	According to the Biot-Savart law, the field due to a current element is zero at points:	Physics Biot-Savart law	Medium
66	The SI unit of magnetic field B is:	Physics Biot-Savart law	Easy
67	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
68	A long straight wire carries a current of 10 A. The magnetic field 5 cm from it is:	Physics Ampere’s law	Easy
69	A long solenoid has 1000 turns per metre and carries 2 A. The field inside it is about:	Physics Ampere’s law	Medium
70	The magnetic field just outside a long ideal solenoid is:	Physics Ampere’s law	Easy
71	The field lines around a long straight current-carrying wire are:	Physics Ampere’s law	Medium
72	The magnetic field at distance r from a long straight wire is B. At distance 3r the field is:	Physics Ampere’s law	Hard
73	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
74	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
75	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
76	The work done by a magnetic field on a moving charged particle is:	Physics Force on moving charges and conductors	Medium
77	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
78	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
79	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
80	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