Magnetic Effects of Current and Magnetism (AIIMS Physics): Questions 45 - 48 of 49

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Question number: 45

» Magnetic Effects of Current and Magnetism » Magnet Oscillations

MCQ▾

Question

A compass needle oscillates 10 times per minute at a place where dip is 60° and 30 times per minute where the dip is 30° . Compare the total magnetic field of earth at two places.

Choices

Choice (4) Response

a.

33

b.

3

c.

3

d.

23

Question number: 46

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

MCQ▾

Question

A current of 3A flows through two long parallel wires. The magnetic force on each wire is 1×103Nm. If their currents makes doubled and separation between them makes 14th of initial value then magnetic force per unit length of each wire becomes –

Choices

Choice (4) Response

a.

16×103Nm

b.

8×103Nm

c.

32×103Nm

d.

4×103Nm

Question number: 47

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

The magnetic field at a distance 30cm from a 8cm long magnet, which has magnetic pole strength 14Am , is –

Choices

Choice (4) Response

a.

1.07×104T

b.

3.7×104T

c.

2.14×104T

d.

1.5×105T

Question number: 48

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

Question

A galvanometer coil has a resistance of 990Ω and it shows full scale deflection for a current of 10mA . Calculate the value of resistance required to convert it into an ammeter of range 1A .

Choices

Choice (4) Response

a.

10Ω

b.

5Ω

c.

8Ω

d.

15Ω

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