Magnetic Fields Due to Electric Current

A straight wire of length 1 m, and carrying a current of 1.8 A, is placed in a uniform magnetic field of induction 2 T. If the magnetic field is perpendicular to the length of the wire, then the force acting on the wire is

The force acting on a particle of charge $q$ moving in a uniform magnetic field with velocity ' v ' is

Two wires with currents 2 A and 1 A are enclosed in a circular loop. Another wire with current 3 A is situated outside the loop as shown. The $\oint\vec{B}\cdot d\vec{l}$ around the loop is

A charge moving with velocity $v$ in $X$-direction is subjected to a field of magnetic induction in negative $X$-direction. As a result, the charge will

Two identical light sources $s_{1}$ and $s_{2}$ emit light of same wavelength $\lambda$. These light rays will exhibit interference if their

Lorentz magnetic force is acting on a particle of charge $q$ moving with velocity $\vec{V}$ in magnetic field $\vec{B}$. The work done by this force on the charged particle is

Lorentz magnetic force is acting on a particle of charge q moving with velocity $\vec{V}$ in a magnetic field $\vec{B}$. The work done by this force on the charged particle is

The strength of magnetic field at a perpendicular distance ${ }^{\prime} x$ ' near a long straight conductor carrying current ' $I$ ' is ' $B$ '. The magnetic field at a distance $\dfrac{x}{3}$ from straight conductor will be

A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the current is double and the number of turns per cm is halved, the new value of the magnetic field is

When a charged particle moving with velocity $\vec{v}$ is subjected to a magnetic field of induction $\vec{B}$, the force on it is non-zero. This implies that

A charge moving with velocity $v$ in $X$-direction is subjected to a field of magnetic induction in negative $X$-direction. As a result, the charge will

A current carrying loop is freely suspended by a long thread. The area vector of the plane of the loop will

The strength of the magnetic field at a point distant $r$ near a long straight current carrying wire is $B$. The field at a distance $\dfrac{r}{2}$ will be

The magnetic moment of a current $(I)$ carrying circular coil of radius $r$ and number of turns $N$ varies as

A charged particle (charge $=q$ : mass $=m$ ) is rotating in a circle of radius ' R ' with uniform speed ' v '. Ratio of its magnetic moment (M) to the angular momentum (L) is