00. Biot-Savart's Law and Magnetic Field, Lorentz Force
Moving Charges & Magnetism

153293 A particle carrying a charge to 100 times the charge on an electron is rotating per second in a circular path of radius $0.8 \mathrm{~m}$. The value of the magnetic field produced at the centre will be ( $\mu_{0}=$ permeability for vacuum)

1 $\frac{10^{-7}}{\mu_{0}}$
2 $10^{-17} \mu_{0}$
3 $10^{-6} \mu_{0}$
4 $10^{-7} \mu_{0}$
Moving Charges & Magnetism

153294 In the hydrogen atom, the electron is making $6.6 \times 10^{15}$ rps. If the radius of orbits is $0.53 \times 10^{-}$ ${ }^{10} \mathrm{~m}$, then magnetic field produced at the centre of the orbit is

1 $140 \mathrm{~T}$
2 $12.5 \mathrm{~T}$
3 $1.4 \mathrm{~T}$
4 $0.14 \mathrm{~T}$
Moving Charges & Magnetism

153295 A wire of length $l$ is bent into a circular loop of radius $R$ and carries a current $I$. The magnetic field at the centre of the loop is $B$. The same wire is now bent into a double loop of equal radii. If both loops carry the same current $I$ and it is in the same direction, the magnetic field at the centre of the double loop will be

1 Zero
2 $2 \mathrm{~B}$
3 $4 \mathrm{~B}$
4 $8 \mathrm{~B}$
Moving Charges & Magnetism

153296 A circular coil of radius $40 \mathrm{~mm}$ consists of 250 turns of wire in which the current is $20 \mathrm{~mA}$. The magnetic field in the center of the coil is $\left[\mu=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right.$ ]

1 $0.785 \mathrm{G}$
2 $0.525 \mathrm{G}$
3 $0.629 \mathrm{G}$
4 $0.900 \mathrm{G}$
Moving Charges & Magnetism

153293 A particle carrying a charge to 100 times the charge on an electron is rotating per second in a circular path of radius $0.8 \mathrm{~m}$. The value of the magnetic field produced at the centre will be ( $\mu_{0}=$ permeability for vacuum)

1 $\frac{10^{-7}}{\mu_{0}}$
2 $10^{-17} \mu_{0}$
3 $10^{-6} \mu_{0}$
4 $10^{-7} \mu_{0}$
Moving Charges & Magnetism

153294 In the hydrogen atom, the electron is making $6.6 \times 10^{15}$ rps. If the radius of orbits is $0.53 \times 10^{-}$ ${ }^{10} \mathrm{~m}$, then magnetic field produced at the centre of the orbit is

1 $140 \mathrm{~T}$
2 $12.5 \mathrm{~T}$
3 $1.4 \mathrm{~T}$
4 $0.14 \mathrm{~T}$
Moving Charges & Magnetism

153295 A wire of length $l$ is bent into a circular loop of radius $R$ and carries a current $I$. The magnetic field at the centre of the loop is $B$. The same wire is now bent into a double loop of equal radii. If both loops carry the same current $I$ and it is in the same direction, the magnetic field at the centre of the double loop will be

1 Zero
2 $2 \mathrm{~B}$
3 $4 \mathrm{~B}$
4 $8 \mathrm{~B}$
Moving Charges & Magnetism

153296 A circular coil of radius $40 \mathrm{~mm}$ consists of 250 turns of wire in which the current is $20 \mathrm{~mA}$. The magnetic field in the center of the coil is $\left[\mu=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right.$ ]

1 $0.785 \mathrm{G}$
2 $0.525 \mathrm{G}$
3 $0.629 \mathrm{G}$
4 $0.900 \mathrm{G}$
Moving Charges & Magnetism

153293 A particle carrying a charge to 100 times the charge on an electron is rotating per second in a circular path of radius $0.8 \mathrm{~m}$. The value of the magnetic field produced at the centre will be ( $\mu_{0}=$ permeability for vacuum)

1 $\frac{10^{-7}}{\mu_{0}}$
2 $10^{-17} \mu_{0}$
3 $10^{-6} \mu_{0}$
4 $10^{-7} \mu_{0}$
Moving Charges & Magnetism

153294 In the hydrogen atom, the electron is making $6.6 \times 10^{15}$ rps. If the radius of orbits is $0.53 \times 10^{-}$ ${ }^{10} \mathrm{~m}$, then magnetic field produced at the centre of the orbit is

1 $140 \mathrm{~T}$
2 $12.5 \mathrm{~T}$
3 $1.4 \mathrm{~T}$
4 $0.14 \mathrm{~T}$
Moving Charges & Magnetism

153295 A wire of length $l$ is bent into a circular loop of radius $R$ and carries a current $I$. The magnetic field at the centre of the loop is $B$. The same wire is now bent into a double loop of equal radii. If both loops carry the same current $I$ and it is in the same direction, the magnetic field at the centre of the double loop will be

1 Zero
2 $2 \mathrm{~B}$
3 $4 \mathrm{~B}$
4 $8 \mathrm{~B}$
Moving Charges & Magnetism

153296 A circular coil of radius $40 \mathrm{~mm}$ consists of 250 turns of wire in which the current is $20 \mathrm{~mA}$. The magnetic field in the center of the coil is $\left[\mu=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right.$ ]

1 $0.785 \mathrm{G}$
2 $0.525 \mathrm{G}$
3 $0.629 \mathrm{G}$
4 $0.900 \mathrm{G}$
Moving Charges & Magnetism

153293 A particle carrying a charge to 100 times the charge on an electron is rotating per second in a circular path of radius $0.8 \mathrm{~m}$. The value of the magnetic field produced at the centre will be ( $\mu_{0}=$ permeability for vacuum)

1 $\frac{10^{-7}}{\mu_{0}}$
2 $10^{-17} \mu_{0}$
3 $10^{-6} \mu_{0}$
4 $10^{-7} \mu_{0}$
Moving Charges & Magnetism

153294 In the hydrogen atom, the electron is making $6.6 \times 10^{15}$ rps. If the radius of orbits is $0.53 \times 10^{-}$ ${ }^{10} \mathrm{~m}$, then magnetic field produced at the centre of the orbit is

1 $140 \mathrm{~T}$
2 $12.5 \mathrm{~T}$
3 $1.4 \mathrm{~T}$
4 $0.14 \mathrm{~T}$
Moving Charges & Magnetism

153295 A wire of length $l$ is bent into a circular loop of radius $R$ and carries a current $I$. The magnetic field at the centre of the loop is $B$. The same wire is now bent into a double loop of equal radii. If both loops carry the same current $I$ and it is in the same direction, the magnetic field at the centre of the double loop will be

1 Zero
2 $2 \mathrm{~B}$
3 $4 \mathrm{~B}$
4 $8 \mathrm{~B}$
Moving Charges & Magnetism

153296 A circular coil of radius $40 \mathrm{~mm}$ consists of 250 turns of wire in which the current is $20 \mathrm{~mA}$. The magnetic field in the center of the coil is $\left[\mu=4 \pi \times 10^{-7} \mathbf{H m}^{-1}\right.$ ]

1 $0.785 \mathrm{G}$
2 $0.525 \mathrm{G}$
3 $0.629 \mathrm{G}$
4 $0.900 \mathrm{G}$
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