# Magnetic Effects of Current and Magnetism-Electric Charge Moving in Magnetic Field (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 8 - 12 of 29

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## Question number: 8

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

MCQ▾

### Question

A proton is to circulate the earth along the equator with a speed of 1.0 x 10 7 m/s. The minimum magnetic field which should be created at the equator for this purpose. (The mass of proton = 1.7 x 10 -27 kg and radius of earth = 6.37 x 10 6 m) magnetic field will be (in Wb/m 2)

### Choices

Choice (4) Response

a.

2 x 10 -7

b.

1.0 x 10 -7

c.

1.67 x 10 -8

d.

1.6 x 10 -19

## Question number: 9

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

MCQ▾

### Question

A l m long conducting wire is lying at right angles to the magnetic field. A force of 1 kg weight is acting on it in a magnetic field of 0.98 tesla. The current flowing in it will be,

### Choices

Choice (4) Response

a.

10 A

b.

100 A

c.

1A

d.

0

## Question number: 10

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

MCQ▾

### Question

In the example above, after how much time, particle comes to the starting point for the first time, (mass of particle = m)

### Choices

Choice (4) Response

a.

b.

Never

c.

It will leave the circular path before coming to the starting point

d.

## Question number: 11

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

MCQ▾

### Question

A current of 2.0 amp is flowing through a wire of length 50 cm. If this wire be placed at an angle of 60° with the direction of a uniform magnetic field of 5.0 x 10 -4 N/Am the force on the wire will be,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 12

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

MCQ▾

### Question

A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region x < b is

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page