Ampere’s Law and its Applications to Infinitely Long Current Carrying Straight Wire and Solenoid NEET Questions

Physics - Magnetic Effects of Current and Magnetism

Ampere’s Law and its Applications to Infinitely Long Current Carrying Straight Wire and Solenoid MCQ Questions


7.
The magnetic field lines around a long straight current-carrying wire are:
A.
Concentric circles perpendicular to wire
B.
Parallel to the wire
C.
Helical
D.
Radial from the wire
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ANSWER :
A. Concentric circles perpendicular to wire
8.
In Ampere's law ∮B·dl = μ₀I, the closed path is called:
A.
Field line
B.
Gaussian surface
C.
Solenoidal path
D.
Amperian loop
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ANSWER :
D. Amperian loop
9.
A solenoid of length 0.5 m has 1000 turns and carries a current of 2 A. The magnetic field inside is:
A.
4π × 10⁻³ T
B.
5.02 × 10⁻³ T
C.
1 × 10⁻³ T
D.
2.51 × 10⁻³ T
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ANSWER :
B. 5.02 × 10⁻³ T
10.
For Ampere's law to give easy results, the Amperian loop should be chosen such that:
A.
It must be circular
B.
Any loop works equally well
C.
B is tangential and constant, or normal, or zero along segments
D.
It always encloses all the current
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ANSWER :
C. B is tangential and constant, or normal, or zero along segments
11.
The magnetic field at a distance of 2 cm from a long straight wire carrying current is B. At a distance of 6 cm, it will be:
A.
B/9
B.
B/3
C.
3B
D.
9B
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ANSWER :
B. B/3
12.
Two parallel wires carry currents I₁ and I₂ in the same direction. The force between them is:
A.
Zero
B.
Attractive
C.
Repulsive
D.
Depends on medium only
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ANSWER :
B. Attractive