JEE Questions for Physics Moving Charges And Magnetism Quiz 6

Physics-Moving Charges and Magnetism-82637.png

0%
Proportional to a
0%
Proportional to a2
0%
Proportional to 1/a
0%
Zero

A helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be

0%
0%
2)
0%
0%

Consider two straight parallel conductors A and B separated by distance x and carrying individual currents i_A and i_B respectively. If the two conductors attract each other, it indicates that

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The two currents are parallel in direction
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The two currents are antiparallel in direction
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The magnetic lines of induction are parallel
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The magnetic lines of induction are parallel to length of conductors

The strength of the magnetic field at a point r near a long straight current carrying wire is B. The field at a distance r/2 will be

0%
0%
2)
0%
2B
0%
4B

Field at the centre of a circular coil of radius r, through which a current I flows is

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Directly proportional to r
0%
Inversely proportional to I
0%
Directly proportional to I
0%
Directly proportional to 12

Current ‘I’ is flowing in a conductor shaped as shown in the figure. The radius of the curved part is r and the length of straight portion is very large. The value of the magnetic field at the centre O will be
Physics-Moving Charges and Magnetism-82648.png

Physics-Moving Charges and Magnetism-82648.png

0%
0%
2)
0%
0%

The magnetic field B with in the solenoid having n turns per metre length and carrying a current of i ampere is given by

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0%
2)
0%
0%

The magnetic induction at the centre 0 in the figure shown is
Physics-Moving Charges and Magnetism-82659.png

0%
0%
2)
0%
0%

In the above question, the magnetic induction at O due to the whole length of the conductor is

0%
0%
2)
0%
0%
Zero

In the figure shown there are two semicircles of radii r₁ and r₂ in which a current i is flowing. The magnetic induction at the centre Owill be
Physics-Moving Charges and Magnetism-82670.png

Physics-Moving Charges and Magnetism-82670.png

0%
0%
2)
0%
0%

A wire of length l is bent into a circular loop of radius R and carries a current I. The magnetic field at the centre of the loop is B. The same wire is now bent into a double loop of equal radii. If both loops carry the same current I and it is in the same direction, the magnetic field at the centre of the double loop will be

0%
Zero
0%
2 B
0%
4 B
0%
8 B

A particle carrying a charge equal to 100 times the charge on an electron is rotating per second in a circular path of radius 0.8 metre. The value of the magnetic field produced at the centre will be (μ₀ = permeability for vacuum)

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0%
2)
0%
0%

In hydrogen atom, an electron is revolving in the orbit of radius 0.53 Å with 6.6 × 10¹⁵ rotations/second. Magnetic field produced at the centre of the orbit is

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0.125 wb/m2
0%
1.25 wb/m2
0%
12.5 wb/m2
0%
125 wb/m2

Magnetic effect of current was discovered by

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Faraday
0%
Oersted
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Ampere
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Bohr

A long solenoid has a radius a and number of turns per unit length n. If it carries a current i, then the magnetic field on its axis is directly proportional to

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ani
0%
ni
0%
ni/a
0%
n2 i

A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be
(Here i₁ and i₂ are the currents flowing in the two parts of the circular conductor of radius \'a\' and μ₀ has the usual meaning)

0%
Zero
0%
2)
0%
0%

A long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 millitesla inside the solenoid will be approximately
Physics-Moving Charges and Magnetism-82687.png

Physics-Moving Charges and Magnetism-82687.png

0%
8.0 A
0%
4.0 A
0%
2.0 A
0%
1.0 A

A battery is connected between two points A and B on the circumference of a uniform conducting ring of radius r and resistance R. One of the arcs AB of the ring subtends an angle θ at the centre. The value of the magnetic induction at the centre due to the current in the ring is

0%
Proportional to 2 (180°– θ)
0%
Inversely proportional to r
0%
Zero, only if θ =180°
0%
Zero for all value of θ

A current of 1 ampere is passed through a straight wire of length 2.0 metres. The magnetic field at a point in air at a distance of 3 metres from either end of wire and lying on the axis of wire will be

0%
0%
2)
0%
0%
Zero

A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is

0%
0%
2)
0%
0%
Zero

A straight wire of length (π²) metre is carrying a current of 2A and the magnetic field due to it is measured at a point distant 1 cm from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be

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50 : 1
0%
1 : 50
0%
100 : 1
0%
1 : 100

Due to 10 ampere of current flowing in a circular coil of 10cm radius, the magnetic field produced at its centre is 3.14 × 10^–3 weber/m². The number of turns in the coil will be

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5000
0%
100
0%
50
0%
25

There are 50 turns of a wire in every cm length of a long solenoid. If 4 ampere current is flowing in the solenoid, the approximate value of magnetic field along its axis at an internal point and at one end will be respectively

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12.6 × 10–3 weber/m2, 6.3 × 10–3 weber/m2
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12.6 × 10–3 weber/m2, 25.1 × 10–3 weber/m2
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25.1 × 10–3 weber/m2, 6.3 × 10–3 weber/m2
0%
25.1 × 10–5 weber/m2, 6.3 × 10–5 weber/m2

A steady electric current is flowing through a cylindrical conductor

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The magnetic field in the vicinity of the conductor is zero
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The electric field in the vicinity of the conductor is non-zero
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The magnetic field at the axis of the conductor is zero
0%
The electric field at the axis of the conductor is zero

A vertical wire kept in Z-X plane carries a current from Q to P (see figure). The magnetic field due to current will have the direction at the origin O along
Physics-Moving Charges and Magnetism-82700.png

Physics-Moving Charges and Magnetism-82700.png

0%
0%
2)
0%
0%

In a hydrogen atom, an electron moves in a circular orbit of radius 5.2 × 10^–11 m and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given μ₀ = 4π × 10^–7 Wb/A–m)

0%
6.53 × 10–3 ampere
0%
13.25 × 10–10 ampere
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9.6 × 106 ampere
0%
1.04 × 10–3 ampere

An arc of a circle of radius R subtends an angle π/2 at the centre. It carries a current i. The magnetic field at the centre will be

0%
0%
2)
0%
0%

At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be

0%
0.01 T
0%
0.02 T
0%
0.08 T
0%
0.16 T

The magnetic induction at any point due to a long straight wire carrying a current is

0%
Proportional to the distance from the wire
0%
Inversely proportional to the distance from wire
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Inversely proportional to the square of the distance from the wire
0%
Does not depend on distance

The expression for magnetic induction inside a solenoid of length L carrying a current I and having N number of turns is

0%
0%
2)
0%
0%

In a current carrying long solenoid, the field produced does not depend upon

0%
Number of turns per unit length
0%
Current flowing
0%
Radius of the solenoid
0%
All of the above

A conducting rod of 1 m length and 1 kg mass is suspended by two vertical wires through its ends. An external magnetic field of 2T is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is [Take g = 10 ms^–2]

0%
0.5 A
0%
15 A
0%
5 A
0%
1.5 A

A circular coil \'A\' has a radius R and the current flowing through it is I. Another circular coil ‘B’ has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e., B_A to B_B)

0%
4 : 1
0%
2 : 1
0%
3 : 1
0%
1 : 1

A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then

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The magnetic field at all points inside the pipe is the same but not zero
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The magnetic field at any point inside the pipe is zero
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The magnetic field is zero only on the axis of the pipe
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The magnetic field is different at different points inside the pipe

The magnetic field at the centre of current carrying coil

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0%
2)
0%
0%

A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of magnetic field far away is

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Twice the earlier value
0%
Half of the earlier value
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Quarter of its earlier value
0%
Unchanged

A neutral point is obtained at the centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is

0%
0
0%
45o
0%
60o
0%
90o

One Tesla is equal to

0%
107 gauss
0%
10–4 gauss
0%
104 gauss
0%
10–8 gauss

A current carrying wire in the neighbourhood produces

0%
No field
0%
Electric field only
0%
Magnetic field only
0%
Electric and magnetic fields

A wire PQR is bent as shown in figure and is placed in a region of uniform magnetic field B. The length of PQ = QR = l. A current I ampere flows through the wire as shown. The magnitude is of the force on PQ and QR will be
Physics-Moving Charges and Magnetism-82730.png

Physics-Moving Charges and Magnetism-82730.png

0%
BIl, 0
0%
2BIl, 0
0%
0, BIl
0%
0, 0

Energy in a current carrying coil is stored in the form of

0%
Electrical energy
0%
Magnetic field
0%
Heat
0%
None of these

The magnetic field at the centre of coil of n turns, bent in the form of a square of side 2l, carrying current i, is

0%
0%
2)
0%
0%

Magnetic field due to a ring having n turns at a distance xon its axis is proportional to (if r = radius of ring)

0%
0%
2)
0%
0%

A and B are two concentric circular conductors of centre Oand carrying currents i₁ and i₂ as shown in the adjacent figure. If ratio of their radii is 1 : 2 and ratio of the flux densities at Odue to A and B is 1 : 3, then the value of i₁ /i₂ is
Physics-Moving Charges and Magnetism-82745.png

Physics-Moving Charges and Magnetism-82745.png

0%
1/6
0%
1/4
0%
1/3
0%
1/2

A straight wire of mass 200 g and length 1.5 m carries a current of 2 A. It is suspended in mid-air by a uniform horizontal magnetic field B. The magnitude of B (in tesla) is (assume g = 9.9 ms^–2)

0%
2
0%
1.5
0%
0.55
0%
0.66

A circular loop of radius 0.0157 m carries a current of 2.0 amp. The magnetic field at the centre of the loop is
(μ₀ = 4π × 10^–7 weber/amp-m)

0%
1.57 × 10–5 weber/m2
0%
8.0 × 10–7 weber/m2
0%
2.5 × 10–7 weber/m2
0%
3.14 × 10–7 weber/m2

A long solenoid has 200 turns per cm and carries a current of 2.5 amp. The magnetic field at its centre is (μ₀ = 4π × 10^–7 weber/amp-m)

0%
3.14 × 10–2 weber/m2
0%
6.28 × 10–2 weber/m2
0%
9.42 × 10–2 weber/m2
0%
12.56 × 10–2 weber/m2

Two concentric coplanar circular loops of radii r₁ and r₂ carry currents of respectively i₁ and i₂ in opposite directions (one clockwise and the other anticlockwise). The magnetic induction at the centre of the loops is half that due to i₁ alone at the centre. If r₂ = 2r₁. The value of i₂ / i₁ is

0%
2
0%
1/2
0%
1/4
0%
1

PQRS is a square loop made of uniform conducting wire. If the current enters the loop at P and leaves at S, then the magnetic field will be
Physics-Moving Charges and Magnetism-82751.png

Physics-Moving Charges and Magnetism-82751.png

0%
Maximum at the centre of the loop
0%
Zero at the centre of loop
0%
Zero at all points inside the loop
0%
Zero at all points outside of the loop

Magnetic fields at two points on the axis of the circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8 : 1. The radius of the coil is

0%
1.0 m
0%
0.1 m
0%
0.15 m
0%
0.2 m

JEE Questions for Physics Moving Charges And Magnetism Quiz 6 - MCQExams.com

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JEE Questions for Physics Moving Charges And Magnetism Quiz 6 - MCQExams.com

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