153263 A horizontal overhead powerline is at height of $4 \mathrm{~m}$ from the ground and carries a current of $100 \mathrm{~A}$ from east to west. The magnetic field directly below it on the ground is $\left(\mu_{0}=4 \pi \times 10^{-}\right.$ ${ }^{7} \mathbf{T m ~ A ^ { - 1 } )}$

153264 A wire carrying current $I$ has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to $X$-axis while semicircular portion of radius $\mathrm{R}$ is lying in $\mathrm{Y}-\mathrm{Z}$ plane. Magnetic field at point $O$ is :

153265 Four very long current carrying wires in the same plane intersect to form a square $40.0 \mathrm{~cm}$ on each side as shown in the figure. What is the magnitude of current $I$ so that the magnetic field at the centre of the square is zero?

153266 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

153268 A particle having charge 10 times that of the electron revolves in a circular path of radius $0.4 \mathrm{~m}$ with an angular speed of one rotation per second. The magnetic induction produced at the centre of the circular path is

153263 A horizontal overhead powerline is at height of $4 \mathrm{~m}$ from the ground and carries a current of $100 \mathrm{~A}$ from east to west. The magnetic field directly below it on the ground is $\left(\mu_{0}=4 \pi \times 10^{-}\right.$ ${ }^{7} \mathbf{T m ~ A ^ { - 1 } )}$

153264 A wire carrying current $I$ has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to $X$-axis while semicircular portion of radius $\mathrm{R}$ is lying in $\mathrm{Y}-\mathrm{Z}$ plane. Magnetic field at point $O$ is :

153265 Four very long current carrying wires in the same plane intersect to form a square $40.0 \mathrm{~cm}$ on each side as shown in the figure. What is the magnitude of current $I$ so that the magnetic field at the centre of the square is zero?

153266 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

153268 A particle having charge 10 times that of the electron revolves in a circular path of radius $0.4 \mathrm{~m}$ with an angular speed of one rotation per second. The magnetic induction produced at the centre of the circular path is

153263 A horizontal overhead powerline is at height of $4 \mathrm{~m}$ from the ground and carries a current of $100 \mathrm{~A}$ from east to west. The magnetic field directly below it on the ground is $\left(\mu_{0}=4 \pi \times 10^{-}\right.$ ${ }^{7} \mathbf{T m ~ A ^ { - 1 } )}$

153264 A wire carrying current $I$ has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to $X$-axis while semicircular portion of radius $\mathrm{R}$ is lying in $\mathrm{Y}-\mathrm{Z}$ plane. Magnetic field at point $O$ is :

153265 Four very long current carrying wires in the same plane intersect to form a square $40.0 \mathrm{~cm}$ on each side as shown in the figure. What is the magnitude of current $I$ so that the magnetic field at the centre of the square is zero?

153266 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

153268 A particle having charge 10 times that of the electron revolves in a circular path of radius $0.4 \mathrm{~m}$ with an angular speed of one rotation per second. The magnetic induction produced at the centre of the circular path is

153263 A horizontal overhead powerline is at height of $4 \mathrm{~m}$ from the ground and carries a current of $100 \mathrm{~A}$ from east to west. The magnetic field directly below it on the ground is $\left(\mu_{0}=4 \pi \times 10^{-}\right.$ ${ }^{7} \mathbf{T m ~ A ^ { - 1 } )}$

153264 A wire carrying current $I$ has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to $X$-axis while semicircular portion of radius $\mathrm{R}$ is lying in $\mathrm{Y}-\mathrm{Z}$ plane. Magnetic field at point $O$ is :

153265 Four very long current carrying wires in the same plane intersect to form a square $40.0 \mathrm{~cm}$ on each side as shown in the figure. What is the magnitude of current $I$ so that the magnetic field at the centre of the square is zero?

153266 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

153268 A particle having charge 10 times that of the electron revolves in a circular path of radius $0.4 \mathrm{~m}$ with an angular speed of one rotation per second. The magnetic induction produced at the centre of the circular path is

153263 A horizontal overhead powerline is at height of $4 \mathrm{~m}$ from the ground and carries a current of $100 \mathrm{~A}$ from east to west. The magnetic field directly below it on the ground is $\left(\mu_{0}=4 \pi \times 10^{-}\right.$ ${ }^{7} \mathbf{T m ~ A ^ { - 1 } )}$

153264 A wire carrying current $I$ has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to $X$-axis while semicircular portion of radius $\mathrm{R}$ is lying in $\mathrm{Y}-\mathrm{Z}$ plane. Magnetic field at point $O$ is :

153265 Four very long current carrying wires in the same plane intersect to form a square $40.0 \mathrm{~cm}$ on each side as shown in the figure. What is the magnitude of current $I$ so that the magnetic field at the centre of the square is zero?

153266 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

153268 A particle having charge 10 times that of the electron revolves in a circular path of radius $0.4 \mathrm{~m}$ with an angular speed of one rotation per second. The magnetic induction produced at the centre of the circular path is