An alpha particle is moving perpendicularly to a uniform magnetic field of 3 Tesla with the velocity m/s. What is the work done by the particle? (a) 30 × 10⁶ J (b) 60 × 10⁶ J (c) infinity (d) zero

Two anti-parallel conducting wires carrying currents in the ratio 2:3. What is the nature of the force acting between them? a) Attractive b) Repulsive c) Both attractive and Repulsive d) can not predict.

A Galvanometer of resistance 10 Ω gives full-scale deflection when 1 mA current passes through it. The resistance required to convert it into a voltmeter reading upto 2.5 Volt is; a) 9800 Ω b) 2490 Ω c) 4980 Ω d) 9880 Ω.

What is the shape of the magnet in Moving Coil Galvanometer to make the torque maximum? a) Horse Shoe b) Convex c) Concave d) None of these.

A Galvanometer is said to be sensitive, when- a) Small deflection for a small current b) Small deflection for a large current c) large deflection for a small current d) large deflection for a large current .

The magnetic flux linked with a coil is

Two wires of same length are shaped into a square and a circle. If they carry same current, the ratio of their magnetic moment- a) 2:π b)π:2 c) 4:π d) π:4.

The current sensitivity of a Galvanometer can be increased by decreasing- a) Magnetic field B b) No. of turns N c) Torsional constant k d) Area of the coil A

A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is- a) B b) 4B c) 2B d) 8B.

A solenoid has 1000 turns per metre length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is-

If distance between two current- carrying wires is doubled, then force between them is (a) halved (b) doubled (c) tripled (d) quadrupled.

The coil of a moving coil galvanometer is wound over a metal frame in order to- (a) reduce hysteresis (b) increase sensitivity (c) increase moment of inertia (d) provide electromagnetic damping.

To convert a moving coil galvanometer into on ammeter of given range, we must connect: (a) A suitable low resistance in series (b) A suitable low resistance in parallel (c) A suitable high resistance in parallel (d) A suitable high resistance in series

A deuteron of kinetic energy 50 keV is describing a circular orbits of radius 0.5 m in a plane perpendicular to the magnetic field B . The kinetic energy of the proton that describes a circular orbit of same radius and inside same B is- (a) 25 kev (b) 50 kev (c) 200 kev (d) 100 keV

The magnetic field at an outside point due to a long straight conductor carrying a constant current(I) is independent of a) Material of the conductor b) Radius of the conductor c) Both (a) and (b) d) Neither (a) nor (b)