Force On A Conductor Carrying Current In A Magnetic Field MCQ - Practice Questions with Answers

 A wire carrying current I is tied between points P and Q and is in the shape of a circular arch of radius R due to a uniform magnetic field B (perpendicular to the plane of the paper, shown by xxx) in the vicinity of the wire. If the wire subtends an angle  $2\Theta_0$  at the centre of the circle (of which it forms an arch) then the tension in the wire is :

$\mathrm{A} \& \mathrm{~B}$ are two concentric circular conductors of centre O and carrying currents $i_1$ and $i_2$ as shown. If the ratio of their radii is $1: 2$. and the ratio of their flux densities at $O$ due to $A \& B$ is $1: 3$, then the value of $i_1 / i_2$ is

A rod PQ is connected to the capacitor plates. The rod is placed in a magnetic field (B) directed downward perpendicular to the plane of the paper. If the rod is pulled out of magnetic field with velocity v as shown in figure

A very long current carrying wire is placed along z-axis having current of magnitude i₁ towards negative z-axis. A semicircular wire of radius R and having current i₂ is placed in x-y plane, such that line joining two end points of the semicircular wire passes through long wire as shown in fig. Nearest distance of semicircular wire from long wire is R. The net magnetic force on semicircular wire will be

A wire abc is carrying current I. It is bent as shown in figure placed in a uniform magnetic field of induction B . Length ab=l and abc = 45 °. The ratio of force on ab and on bc is

An infinitely long, straight conductor AB is fixed and a current is passed through it. Another movable straight wire CD of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire

A hypothetical magnetic fields existing in a region is given by    where   denotes the unit vector along the radial direction. A circular loop of radius ' a ' carrying a current I, is placed with its plane parallel to the x-y plane and the centre at (0,0, d). The magnitude of the magnetic force acting on the loop is :

A straight wire of length 0.5 meter and carrying a current of 1.2 ampere is placed in uniform magnetic field of induction 2 tesla. The magnetic field is perpendicular to the length of the wire. The force on the wire is

A square loop ABCD carrying a current i, is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be :

ABCD is a rectangular loop made of uniform wire. The length AD=BC=1cm. The sides AB and DC are long as compared to the other two sides. Find the magnetic force per unit length of the wire DC due to the wire AB, If the ammeter reads 10A.