# Magnetic Effects of Current and Magnetism-Biot - Savart Law (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 4 - 6 of 6

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## Question number: 4

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

Appeared in Year: 2015

MCQ▾

### Question

A wire bent in the shape of a regular n polygonal loop carries a steady current I. Let I be the perpendicular distance of a given segment and R be the distance of given segment and R be the distance of a vertex both from the centre of the loop. The magnitude of the magnetic field at the centre of the loop is given by.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 5

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

Appeared in Year: 2015

MCQ▾

### Question

A point charge Q rotates uniformly in a vertical circle of radius R = 1 mm. The axis of the circle is aligned along the magnetic axis of the earth. At what value of the angular speed ω, the effective magnetic field at the centre of the circle will be reduced to zero? (Horizontal component of Earth’s magnetic field is 30 micro Tesla)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 6

» 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 is . The magnitude of magnetic field at a point lying on the axis of the coil at a distance from the centre of the coil is –

### Choices

Choice (4) Response

a.

b.

c.

d.

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