The magnetic lines of force inside a bar magnet
The magnetic lines of force inside a bar magnet
Options
(a) Are from south pole to north pole of the magnet (b) Are from north pole to south pole of the magnet (c) […]
Physics
A long straight wire carrying current of 30A is placed in an external uniform
A long straight wire carrying current of 30A is placed in an external uniform magnetic field of induction 4 x 10⁻⁴ T. The magnetic field is acting parallel to the direction of the current. The […]
The magnetic field at a point on the axis of a long solenoid having 5 turns per cm
The magnetic field at a point on the axis of a long solenoid having 5 turns per cm length when a current of 0.8 A flows through it is
Options
(a) 5.024×10⁻⁸ Wb/m² […]
In a tangent galvanometer, a current of 0.1 A produces a deflection of 30⁰.
In a tangent galvanometer, a current of 0.1 A produces a deflection of 30⁰. The current required to produce a deflection of 60⁰ is
Options
(a) 0.2 A (b) 0.3 A (c) 0.4 […]
A wire in the form of a circular loop of one turn, carrying a current, produces
A wire in the form of a circular loop of one turn, carrying a current, produces a magnetic field B at the centre. If the same wire is looped into a coil of two turns […]
A long straight wire is carrying a current of 12 A. The magnetic field at a distance
A long straight wire is carrying a current of 12 A. The magnetic field at a distance of 8 cm is (μ₀=4πx10⁻⁷ N A²)
Options
(a) 2×10⁻⁴ Wb/m² (b) 3×10⁻⁵ Wb/m² (c) 4×10⁻⁴Wb/m² […]
In a mass spectrometer used for measuring the masses of ions, the ions
In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular path of radius R using a magnetic field […]
A current of 2 A is made to flow through a coil which has only one turn. The magnetic
A current of 2 A is made to flow through a coil which has only one turn. The magnetic field produced at the centre is 4πx10⁻⁶ Wb/m². The radius of the coil is
Options […]
A metal rod of length l cuts across a uniform magnetic field B with a velocity v.
A metal rod of length l cuts across a uniform magnetic field B with a velocity v. If the resistance of the circuit of which the rod forms a part is r, then the force […]
Two charged particles have charges and masses in the ratio 2:3 and 1:4 respectively.
Two charged particles have charges and masses in the ratio 2:3 and 1:4 respectively. If they enter a uniform magnetic field and move with the same velocity, then the ratio of their respective time periods […]