NEET Physics: Questions 672 - 677 of 2098

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Question number: 672

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

Calculate magnetic induction at a distance of 20 cm from a pole of strength 40 Am in air.

Choices

Choice (4) Response

a.

101wbm2

b.

108wbm2

c.

104wbm2

d.

1012wbm2

Question number: 673

» Magnetic Effects of Current and Magnetism » Hysteresis

MCQ▾

Question

The use of study of hysteresis curve for a given material is to estimate the

Choices

Choice (4) Response

a.

Current loss

b.

Voltage loss

c.

hysteresis loss

d.

all

Question number: 674

» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances

MCQ▾

Question

Susceptibility of ferromagnetic substance is

Choices

Choice (4) Response

a.

1

b.

> 1

c.

0

d.

< 1

Question number: 675

» Magnetic Effects of Current and Magnetism » Magnetic Susceptibility and Permeability

MCQ▾

Question

The relative permeability is represented by μr and the susceptibility is denoted by χ for a magnetic substance. Then for a paramagnetic substance

Choices

Choice (4) Response

a.

μr<1,χ>0

b.

μr>1,χ<0

c.

μr>1,χ>0

d.

μr<1,χ<0

Question number: 676

» Magnetic Effects of Current and Magnetism » Ampere's Law

MCQ▾

Question

charge moves in magnetic field B with velocity v making an angle θ with B. The force on the charge will be maximum if,

Choices

Choice (4) Response

a.

θ=450

b.

θ=1200

c.

θ=00

d.

θ=900

Question number: 677

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

An airplane having a distance of 50 meter between the edges of its wings is flying horizontally with a speed of 360km/hour. If the vertical component of earth’s magnetic field is 4 x 10 -4 weber/m 2, then the induced emf between the edges of its wings will be -

Choices

Choice (4) Response

a.

2 V

b.

0.2 V

c.

2 mV

d.

20 V

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