KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 75 - 77 of 268

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Question number: 75

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

Appeared in Year: 2012

MCQ▾

Question

A loop carrying current Ι has the shape of a regular polygon of n sides. If R is the distance from the centre to any vertex, then the magnitude of the magnetic induction vector B at the centre of the loop is –

Choices

Choice (4) Response

a.

nμ0I2πRtan2πn

b.

nμ0I2πRtanπn

c.

μ0IπRtanπn

d.

μ0I2R

Question number: 76

» Kinematics » Motion in a Plane

Appeared in Year: 2011

MCQ▾

Question

The surface of a planet is found to be uniformly charged. When a particle of mass m and no charge is thrown at an angle from the surface of the planet, it has a parabolic trajectory as in projectile motion with horizontal range L. A particle of mass m and charge q, with the same initial conditions has a range L2 . The range of particle of mass m and charge 2q with the same initial conditions is –

Choices

Choice (4) Response

a.

L

b.

L3

c.

L2

d.

L4

Question number: 77

» Physics and Measurement » Dimensional Analysis and Its Applications

Appeared in Year: 2012

MCQ▾

Question

The potential energy of a point particle is given by the expression V(x)=αx+βsin(xγ) . A dimensionless combination of the constants α, β and γ is –

Choices

Choice (4) Response

a.

αβγ

b.

α2βγ

c.

γαβ

d.

αγβ

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