A wire of one metre length carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B.The same is now bent to […]
Two straight wires each 10 cm long are parallel to one another and seperated by 2 cm. When the current flowing in them is 30A and 40 A respectively, then the force experienced by either […]
A particle of mass m, charge Q and kinetic enery T enters a transverse uniform magnetic field of induction B⃗. After 3 seconds, the kinetic energy of the particle will be:
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(a) […]
The magnetic lines of force inside a bar magnet
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(a) Are from south pole to north pole of the magnet (b) Are from north pole to south pole of the magnet (c) […]
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 length when a current of 0.8 A flows through it is
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(a) 5.024×10⁻⁸ Wb/m² […]
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
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(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 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 of 8 cm is (μ₀=4πx10⁻⁷ N A²)
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(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 are initially accelerated by an electric potential V and then made to describe semicircular path of radius R using a magnetic field […]
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