AIIMS Physics: Questions 16 - 18 of 500

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Question number: 16

» Electromagnetic Induction & Alternating Currents » Eddy Currents

Appeared in Year: 2006

MCQ▾

Question

A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at t = 0 and completely emerges out at t = T sec. The current in the ring varies as – [AIIMS]

Choices

Choice (4) Response

a.

Current varies with time (Choice-A)

Current Varies With Time (Choice-A)

Figure shows current in the ring varies with time.

b.

Current varies with time (Choice-B)

Current Varies With Time (Choice-B)

Figure shows current in the ring varies with time.

c.

Current varies with time (Choice-C)

Current Varies With Time (Choice-C)

Figure shows current in the ring varies with time.

d.

 Current varies with time (Choice-D)

Current Varies With Time (Choice-D)

Figure shows current in the ring varies with time.

Question number: 17

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Appeared in Year: 1999

MCQ▾

Question

Two identically charged particles A and B initially at rest are accelerated by a common potential difference V. They enter into a uniform transverse magnetic field B and describe a circular path of radii r1, and r2 respectively then their mass ratio is: [AIPMT]

Choices

Choice (4) Response

a.

(r2r1)

b.

(r1r2)2

c.

(r1r2)

d.

(r2r1)2

Question number: 18

» X - Rays » Soft and Hard X - Ray

Appeared in Year: 2006

MCQ▾

Question

Hard X-rays for the study of fractures in bones should have a minimum wavelength of 10-11 m. The accelerating voltage for electrons in X-rays machine should be – [AIIMS]

Choices

Choice (4) Response

a.

Between60kVand70kV

b.

100 kV

c.

<124.2kV

d.

>124.2kV

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