Objective Problems [ Level 1 ]

A circular coil of $20$ turns and radius $10 \mathrm{cm}$ is placed in uniform magnetic field of $0.10 \mathrm{T}$ normal to the plane of the coil. If the current in coil is $5 \mathrm{A}$, then the torque acting on the coil will be

A conducting loop carrying a current $I$ is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to

If a current is passed through a spring, then the spring will

A circular loop which is in the form of a major arc of a circle is kept in the horizontal plane and a constant magnetic field $B$ is applied in the vertical direction such that the magnetic lines of forces go into the plane. If $R$ is the radius of circle and it carries a current $I$ in the clockwise direction, then the force on the loop will be

A wire of length $2 \mathrm{m}$ carrying a current of $1 \mathrm{A}$ is bend to form a circle. The magnetic moment of the coil is $\left(\mathrm{in} \mathrm{A} {\mathrm{m}}^2\right)$ 

Figure shows three long straight wires parallel and equally spaced with identical currents. Then the magnitude of net force acting on each wire due to the other is $F_{\mathrm{a}}, F_{\mathrm{b}} \text{and} F_{\mathrm{c}}$ for wires $a, b \text{and} c$ respectively:

In two parallel wires $A$ and $B,10 \mathrm{A}$ and $2 \mathrm{A}$ current respectively is flowing in opposite directions. The distance between the wires is $10 \mathrm{cm}$. If the wire $A$ is of infinite length and wire $B$ is of $2 \mathrm{m}$ length, then the force acting on the wire $B$ will be

A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend on