KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 194 - 196 of 250

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Question number: 194

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

Question

The magnetic field produced at the centre of a coil of radius R carrying a current i is B . The magnitude of magnetic field at a point lying on the axis of the coil at a distance 3R from the centre of the coil is –

Choices

Choice (4) Response

a.

B27

b.

B3

c.

B9

d.

B8

Question number: 195

» Rotational Motion » Moment of Inertia

MCQ▾

Question

A homogeneous sphere of mass M and radius R has moment of inertia I about its diameter. A concentric sphere of radius R4 is carved out from the sphere. What is the moment of inertia of the remaining part about the diameter?

Choices

Choice (4) Response

a.

94I

b.

8180I

c.

10231024I

d.

910I

Question number: 196

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2014

MCQ▾

Question

Consider the system shown below.

System consist of two boxes

System Consist of Two Boxes

In figure two boxes: X of mass 8kg and Y of mass 2 kg is adjacent to each other such that box Y does not slip downward under gravity.

A horizontal force F is applied to a block X of mass 8 kg such that the block Y of mass 2 kg adjacent to it does not slip downwards under gravity. There is no friction between the horizontal plane and the base of the block X. The coefficient of friction between the surfaces of blocks X and Y is 0.5. Take acceleration due to gravity to be 10 ms–2. The minimum value of F is,

Choices

Choice (4) Response

a.

240N

b.

40N

c.

200N

d.

160N

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