# Magnetic Effects of Current and Magnetism (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 4 - 6 of 11

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## Question number: 4

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

Appeared in Year: 2013

MCQ▾

### Question

An electron enters a chamber in which a uniform magnetic field is present as shown. Ignore gravity,

During its motion inside the chamber

### Choices

Choice (4) Response

a.

The speed of the electron increases at a uniform rate

b.

The force on the electron remains constant

c.

The kinetic energy of the electron remains constant

d.

The momentum of the electron remains constant

## Question number: 5

» 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.

c.

d.

0.9 mm

## Question number: 6

» 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.

f Page