Magnetic Effects of Current and Magnetism (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 4 - 6 of 10

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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,

An electron enters in a chamber

An Electron Enters in a Chamber

Figure shows that an electron enters a chamber in which a uniform magnetic field is present.

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.

9×102cm

c.

101cm

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.

nμoI2πIcos(πn)

b.

nμ0I2πRcos(πn)

c.

nμ0I2πlsin(πn)

d.

nμ0I2πRsin(πn)

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