Magnetic Effects of Current and Magnetism-Biot - Savart Law (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 3 of 6

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Question number: 1

» 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: 2

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

Appeared in Year: 2013

MCQ▾

Question

An arrangement with a pair of quarter circular coils of radii r and R with a common centre C and carrying a current (I) are shown.

An arrangement with a pair of quarter circular coils

An Arrangement With a Pair of Quarter Circular Coils

Figure shows an arrangement with a pair of quarter circular coils of radii r and R with common centre C and it carrying current (I).

The permeability of free space is μ0. The magnetic field at C is –

Choices

Choice (4) Response

a.

μ0I8(1r+1R) out of the page

b.

μ0I8(1r1R) into the page

c.

μ0I8(1r1R) out of the page

d.

μ0I8(1r+1R) into the page

Question number: 3

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

MCQ▾

Question

A long horizontal fixed wire carries a current of 15 A. A fine thin wire carrying a current 15 A and weighing 0.05 N/m is directly over it and parallel to it. The distance at which the second wire is just supported by the magnetic repulsion is –

Choices

Choice (4) Response

a.

9 m

b.

9×102cm

c.

101cm

d.

0.9 mm

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