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

153269 Two long parallel wires carrying equal currents which are $8 \mathrm{~cm}$ apart produce a magnetic field of $200 \mu \mathrm{T}$ mid way between them. The magnitude of the current in each wire is

1 $10 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $300 \mathrm{~A}$
4 $40 \mathrm{~A}$
5 $50 \mathrm{~A}$
Kerala CEE - 2015
Moving Charges & Magnetism

153270 Two identical coils of 5 turns each carry 1 A and 2 A current respectively. Assume that they have common centre with their planes parallel to each other. If their radius is $1 \mathrm{~m}$ each and the direction of flow of current in the coils are in opposite directions, then the magnetic field produced on its axial line at a distance of $\sqrt{3} \mathrm{~m}$, from the common centre is (in tesla)

1 0
2 $\frac{15}{16} \mu_{0}$
3 $\frac{8}{16} \mu_{0}$
4 $\frac{5}{16} \mu_{0}$
5 $\frac{16}{5} \mu_{0}$
Kerala CEE - 2015
Moving Charges & Magnetism

153271 A single turn circular coil is connected to a cell as shown in figure. Magnetic field at the centre $O$ of the coil is

1 $\frac{2 \pi \mathrm{I}}{\mathrm{r}}$
2 $2 \pi \mathrm{Ir}$
3 zero
4 $\frac{\mathrm{I}}{2 \pi \mathrm{r}}$
5 $\frac{\mathrm{I}}{\pi \mathrm{r}}$
Kerala CEE - 2015
Moving Charges & Magnetism

153272 The magnitude of the magnetic field inside a long solenoid is increased by

1 decreasing its radius
2 decreasing the current through it
3 increasing its area of cross-section
4 introducing a medium of higher permeability
5 decreasing the number of turns in it
Kerala CEE- 2014
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Moving Charges & Magnetism

153269 Two long parallel wires carrying equal currents which are $8 \mathrm{~cm}$ apart produce a magnetic field of $200 \mu \mathrm{T}$ mid way between them. The magnitude of the current in each wire is

1 $10 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $300 \mathrm{~A}$
4 $40 \mathrm{~A}$
5 $50 \mathrm{~A}$
Kerala CEE - 2015
Moving Charges & Magnetism

153270 Two identical coils of 5 turns each carry 1 A and 2 A current respectively. Assume that they have common centre with their planes parallel to each other. If their radius is $1 \mathrm{~m}$ each and the direction of flow of current in the coils are in opposite directions, then the magnetic field produced on its axial line at a distance of $\sqrt{3} \mathrm{~m}$, from the common centre is (in tesla)

1 0
2 $\frac{15}{16} \mu_{0}$
3 $\frac{8}{16} \mu_{0}$
4 $\frac{5}{16} \mu_{0}$
5 $\frac{16}{5} \mu_{0}$
Kerala CEE - 2015
Moving Charges & Magnetism

153271 A single turn circular coil is connected to a cell as shown in figure. Magnetic field at the centre $O$ of the coil is

1 $\frac{2 \pi \mathrm{I}}{\mathrm{r}}$
2 $2 \pi \mathrm{Ir}$
3 zero
4 $\frac{\mathrm{I}}{2 \pi \mathrm{r}}$
5 $\frac{\mathrm{I}}{\pi \mathrm{r}}$
Kerala CEE - 2015
Moving Charges & Magnetism

153272 The magnitude of the magnetic field inside a long solenoid is increased by

1 decreasing its radius
2 decreasing the current through it
3 increasing its area of cross-section
4 introducing a medium of higher permeability
5 decreasing the number of turns in it
Kerala CEE- 2014
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Moving Charges & Magnetism

153269 Two long parallel wires carrying equal currents which are $8 \mathrm{~cm}$ apart produce a magnetic field of $200 \mu \mathrm{T}$ mid way between them. The magnitude of the current in each wire is

1 $10 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $300 \mathrm{~A}$
4 $40 \mathrm{~A}$
5 $50 \mathrm{~A}$
Kerala CEE - 2015
Moving Charges & Magnetism

153270 Two identical coils of 5 turns each carry 1 A and 2 A current respectively. Assume that they have common centre with their planes parallel to each other. If their radius is $1 \mathrm{~m}$ each and the direction of flow of current in the coils are in opposite directions, then the magnetic field produced on its axial line at a distance of $\sqrt{3} \mathrm{~m}$, from the common centre is (in tesla)

1 0
2 $\frac{15}{16} \mu_{0}$
3 $\frac{8}{16} \mu_{0}$
4 $\frac{5}{16} \mu_{0}$
5 $\frac{16}{5} \mu_{0}$
Kerala CEE - 2015
Moving Charges & Magnetism

153271 A single turn circular coil is connected to a cell as shown in figure. Magnetic field at the centre $O$ of the coil is

1 $\frac{2 \pi \mathrm{I}}{\mathrm{r}}$
2 $2 \pi \mathrm{Ir}$
3 zero
4 $\frac{\mathrm{I}}{2 \pi \mathrm{r}}$
5 $\frac{\mathrm{I}}{\pi \mathrm{r}}$
Kerala CEE - 2015
Moving Charges & Magnetism

153272 The magnitude of the magnetic field inside a long solenoid is increased by

1 decreasing its radius
2 decreasing the current through it
3 increasing its area of cross-section
4 introducing a medium of higher permeability
5 decreasing the number of turns in it
Kerala CEE- 2014
Join With Us for More Updates
Moving Charges & Magnetism

153269 Two long parallel wires carrying equal currents which are $8 \mathrm{~cm}$ apart produce a magnetic field of $200 \mu \mathrm{T}$ mid way between them. The magnitude of the current in each wire is

1 $10 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $300 \mathrm{~A}$
4 $40 \mathrm{~A}$
5 $50 \mathrm{~A}$
Kerala CEE - 2015
Moving Charges & Magnetism

153270 Two identical coils of 5 turns each carry 1 A and 2 A current respectively. Assume that they have common centre with their planes parallel to each other. If their radius is $1 \mathrm{~m}$ each and the direction of flow of current in the coils are in opposite directions, then the magnetic field produced on its axial line at a distance of $\sqrt{3} \mathrm{~m}$, from the common centre is (in tesla)

1 0
2 $\frac{15}{16} \mu_{0}$
3 $\frac{8}{16} \mu_{0}$
4 $\frac{5}{16} \mu_{0}$
5 $\frac{16}{5} \mu_{0}$
Kerala CEE - 2015
Moving Charges & Magnetism

153271 A single turn circular coil is connected to a cell as shown in figure. Magnetic field at the centre $O$ of the coil is

1 $\frac{2 \pi \mathrm{I}}{\mathrm{r}}$
2 $2 \pi \mathrm{Ir}$
3 zero
4 $\frac{\mathrm{I}}{2 \pi \mathrm{r}}$
5 $\frac{\mathrm{I}}{\pi \mathrm{r}}$
Kerala CEE - 2015
Moving Charges & Magnetism

153272 The magnitude of the magnetic field inside a long solenoid is increased by

1 decreasing its radius
2 decreasing the current through it
3 increasing its area of cross-section
4 introducing a medium of higher permeability
5 decreasing the number of turns in it
Kerala CEE- 2014
For More Updates join with Us