A uniform conducting wire of length length 10a and resistance R is wound up into four turn as a current carrying coil in the shape of equilateral triangle of side a. If current I is flowing through the coil then the magnetic moment of the coil is
The magnetic moment associated with a circular coil of 35 turns and radius 25cm, if it carries a current of 11A is
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A moving coil galvanometer can be converted into an ammeter by:
A galvanometer of resistance 70Ω, is converted to an ammeter by a shunt resistance r_{s} = 0.03Ω. The value of its resistance will become
A circular coil of radius 10cm having 100 turns carries a current of 3.2A. The magnetic field at the center of the coil is
A galvanometer having a resistance of 50Ω, gives a full scale deflection for a current of 0.05A. The length (in metres) of a resistance wire of area of cross section 3 × 10^{−2}cm^{2} that can be used to convert the galvanometer into an ammeter which can read a maximum of 5A current is
(Specific resistance of the wire ρ = 5 × 10^{−7}Ωm)
A circular coil of 70 turns and radius 5 cm carrying a current of 8 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.5 T. The field lines make an angle of 30^{o} with the normal of the coil then the magnitude of the counter torque that must be applied to prevent the coil from turning is
A galvanometer of resistance 10Ω gives fullscale deflection when 1mA current passes through it. The resistance required to convert it into a voltmeter reading upto 2.5V is
In a moving coil galvanometer the deflection (ϕ) on the scale by a pointer attached to the spring is
A short bar magnet has a magnetic moment of 0.65JT^{−1}, then the magnitude and direction of the magnetic field produced by the magnet at a distance 8cm from the centre of magnet on the axis is
12 docs366 tests

12 docs366 tests
