153375
A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by:
1 left-hand thumb rule for up-current and righthand thumb rule for down-current
2 right-hand thumb rule for up-current and left-hand thumb rule for down-current
3 right-hand thumb rule for both up and down currents
4 left-hand thumb rule for both up and down currents
Explanation:
C Right hand thumb Rule - if a current carrying conductor is imagined to be held in your right hand such that the thumb point along the direction of the wrapped fingers will give the direction of magnetic field line. - Hence in our given case the direction of the magnetic lines of force may by described by the right hand thumb rule as shown above for both upward and downward currents.
NDA (I) 2013
Moving Charges & Magnetism
153376
Imagine a current carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is
1 clockwise
2 anti-clockwise
3 into the page
4 out of the page
Explanation:
A According to Ampere's right thumb rule when a current-carrying conductor is placed in the right hand with thumb showing the direction of current and all other fingers are enclosed around the conductor will show the direction of the magnetic field or magnetic lines of forces. Direction of magnetic field line due to a straight current wire with the direction of current downward or into the page will be the clock wise direction.
NDA (I) 2013
Moving Charges & Magnetism
153390
The magnetic field is absent in which one of the following physical situation?
1 Surface of Neutron star
2 Surface of Earth
3 Human nerve fiber
4 At some point on the axis of bar magnet
Explanation:
C In human nerve fiber the magnetic field is absent.
J and K CET-2014
Moving Charges & Magnetism
153396
The intensity of the magnetic induction field at the centre of a single turn circular coil of radius $5 \mathrm{~cm}$ carrying current of $0.9 \mathrm{~A}$
1 $36 \pi \times 10^{-7} \mathrm{~T}$
2 $9 \pi \times 10^{-7} \mathrm{~T}$
3 $36 \pi \times 10^{-6} \mathrm{~T}$
4 $9 \pi \times 10^{-6} \mathrm{~T}$
Explanation:
A Magnetic field at the center of a circular current carrying coil is $\frac{\mu_{0} \mathrm{i}}{2 \mathrm{R}}=\frac{4 \pi \times 10^{-7} \times 0.9}{2 \times 0.05} \mathrm{~T}=36 \pi \times 10^{-7} \mathrm{~T}$
153375
A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by:
1 left-hand thumb rule for up-current and righthand thumb rule for down-current
2 right-hand thumb rule for up-current and left-hand thumb rule for down-current
3 right-hand thumb rule for both up and down currents
4 left-hand thumb rule for both up and down currents
Explanation:
C Right hand thumb Rule - if a current carrying conductor is imagined to be held in your right hand such that the thumb point along the direction of the wrapped fingers will give the direction of magnetic field line. - Hence in our given case the direction of the magnetic lines of force may by described by the right hand thumb rule as shown above for both upward and downward currents.
NDA (I) 2013
Moving Charges & Magnetism
153376
Imagine a current carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is
1 clockwise
2 anti-clockwise
3 into the page
4 out of the page
Explanation:
A According to Ampere's right thumb rule when a current-carrying conductor is placed in the right hand with thumb showing the direction of current and all other fingers are enclosed around the conductor will show the direction of the magnetic field or magnetic lines of forces. Direction of magnetic field line due to a straight current wire with the direction of current downward or into the page will be the clock wise direction.
NDA (I) 2013
Moving Charges & Magnetism
153390
The magnetic field is absent in which one of the following physical situation?
1 Surface of Neutron star
2 Surface of Earth
3 Human nerve fiber
4 At some point on the axis of bar magnet
Explanation:
C In human nerve fiber the magnetic field is absent.
J and K CET-2014
Moving Charges & Magnetism
153396
The intensity of the magnetic induction field at the centre of a single turn circular coil of radius $5 \mathrm{~cm}$ carrying current of $0.9 \mathrm{~A}$
1 $36 \pi \times 10^{-7} \mathrm{~T}$
2 $9 \pi \times 10^{-7} \mathrm{~T}$
3 $36 \pi \times 10^{-6} \mathrm{~T}$
4 $9 \pi \times 10^{-6} \mathrm{~T}$
Explanation:
A Magnetic field at the center of a circular current carrying coil is $\frac{\mu_{0} \mathrm{i}}{2 \mathrm{R}}=\frac{4 \pi \times 10^{-7} \times 0.9}{2 \times 0.05} \mathrm{~T}=36 \pi \times 10^{-7} \mathrm{~T}$
NEET Test Series from KOTA - 10 Papers In MS WORD
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Moving Charges & Magnetism
153375
A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by:
1 left-hand thumb rule for up-current and righthand thumb rule for down-current
2 right-hand thumb rule for up-current and left-hand thumb rule for down-current
3 right-hand thumb rule for both up and down currents
4 left-hand thumb rule for both up and down currents
Explanation:
C Right hand thumb Rule - if a current carrying conductor is imagined to be held in your right hand such that the thumb point along the direction of the wrapped fingers will give the direction of magnetic field line. - Hence in our given case the direction of the magnetic lines of force may by described by the right hand thumb rule as shown above for both upward and downward currents.
NDA (I) 2013
Moving Charges & Magnetism
153376
Imagine a current carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is
1 clockwise
2 anti-clockwise
3 into the page
4 out of the page
Explanation:
A According to Ampere's right thumb rule when a current-carrying conductor is placed in the right hand with thumb showing the direction of current and all other fingers are enclosed around the conductor will show the direction of the magnetic field or magnetic lines of forces. Direction of magnetic field line due to a straight current wire with the direction of current downward or into the page will be the clock wise direction.
NDA (I) 2013
Moving Charges & Magnetism
153390
The magnetic field is absent in which one of the following physical situation?
1 Surface of Neutron star
2 Surface of Earth
3 Human nerve fiber
4 At some point on the axis of bar magnet
Explanation:
C In human nerve fiber the magnetic field is absent.
J and K CET-2014
Moving Charges & Magnetism
153396
The intensity of the magnetic induction field at the centre of a single turn circular coil of radius $5 \mathrm{~cm}$ carrying current of $0.9 \mathrm{~A}$
1 $36 \pi \times 10^{-7} \mathrm{~T}$
2 $9 \pi \times 10^{-7} \mathrm{~T}$
3 $36 \pi \times 10^{-6} \mathrm{~T}$
4 $9 \pi \times 10^{-6} \mathrm{~T}$
Explanation:
A Magnetic field at the center of a circular current carrying coil is $\frac{\mu_{0} \mathrm{i}}{2 \mathrm{R}}=\frac{4 \pi \times 10^{-7} \times 0.9}{2 \times 0.05} \mathrm{~T}=36 \pi \times 10^{-7} \mathrm{~T}$
153375
A current-carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by:
1 left-hand thumb rule for up-current and righthand thumb rule for down-current
2 right-hand thumb rule for up-current and left-hand thumb rule for down-current
3 right-hand thumb rule for both up and down currents
4 left-hand thumb rule for both up and down currents
Explanation:
C Right hand thumb Rule - if a current carrying conductor is imagined to be held in your right hand such that the thumb point along the direction of the wrapped fingers will give the direction of magnetic field line. - Hence in our given case the direction of the magnetic lines of force may by described by the right hand thumb rule as shown above for both upward and downward currents.
NDA (I) 2013
Moving Charges & Magnetism
153376
Imagine a current carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is
1 clockwise
2 anti-clockwise
3 into the page
4 out of the page
Explanation:
A According to Ampere's right thumb rule when a current-carrying conductor is placed in the right hand with thumb showing the direction of current and all other fingers are enclosed around the conductor will show the direction of the magnetic field or magnetic lines of forces. Direction of magnetic field line due to a straight current wire with the direction of current downward or into the page will be the clock wise direction.
NDA (I) 2013
Moving Charges & Magnetism
153390
The magnetic field is absent in which one of the following physical situation?
1 Surface of Neutron star
2 Surface of Earth
3 Human nerve fiber
4 At some point on the axis of bar magnet
Explanation:
C In human nerve fiber the magnetic field is absent.
J and K CET-2014
Moving Charges & Magnetism
153396
The intensity of the magnetic induction field at the centre of a single turn circular coil of radius $5 \mathrm{~cm}$ carrying current of $0.9 \mathrm{~A}$
1 $36 \pi \times 10^{-7} \mathrm{~T}$
2 $9 \pi \times 10^{-7} \mathrm{~T}$
3 $36 \pi \times 10^{-6} \mathrm{~T}$
4 $9 \pi \times 10^{-6} \mathrm{~T}$
Explanation:
A Magnetic field at the center of a circular current carrying coil is $\frac{\mu_{0} \mathrm{i}}{2 \mathrm{R}}=\frac{4 \pi \times 10^{-7} \times 0.9}{2 \times 0.05} \mathrm{~T}=36 \pi \times 10^{-7} \mathrm{~T}$