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Question (1)

QN0039023

Magnetic field at the centre of a circular coil of radius , through which a current flows is

(A)
directly proportional to
(B)
inverseley proportional to
(C)
directly proportional to
(D)
directly proprotional to

Correct Answer: C

Explanation:

Field at the center of a circular coil of radius is

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Question (2)

QN0039024

A helium nucleus makes a full rotation in a circle of radius 0.8 meter in 2 sec. The value of the magnetic field induction in tesla at the centre of circle will be

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

where

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Question (3)

QN0039025

Which one of the following is the correct expression for magnetic field on the axis of a circular current loop with -axis as its axis?

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (4)

QN0039026

A current of ampere flows in a wire forming a circular arc of radius metres subtending an angle at the centre as shown. The magnetic field at the centre in tesla is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

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Question (5)

QN0039027

An element of is placed at the origin as shown in figure which carries a large current of . distance of in perpendicular direction. The value of magnetic field is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Here, ,

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Question (6)

QN0039028

The magnetic field due to a current carrying circular loop of radius at a point on the axis at a distance
of from the centre is . What will be its value at the centre of loop?

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Put

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Question (7)

QN0039029

Two concentric coils each of radius equal to are placed at right angles to each other. 3 ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in weber at the centre of the coils will be ( A.m)

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

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Question (8)

QN0039030

A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be

(A)
(B)
1.4
(C)
(D)

Correct Answer: B

Explanation:

Let . be length of wire

Ist case :

2nd Case :

where

on putting the value of

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Question (9)

QN0039031

A circular coil of wire consisting of 100 turns each of radius carries a current of . The magnitude of manetic field at the centre of the coil is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Here,

, and

Now,

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Question (10)

QN0039032

If we triple the radius of a coil keeping the current through it unchanged, then the magnetic field at any point at a large distance from the centre becomes approximately how much times?

(A)
9
(B)
8
(C)
4
(D)
3

Correct Answer: C

Explanation:

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Question (1)

Magnetic field at the centre of a circular coil of radius , through which a current flows is

Explanation:

Link:

Question (2)

A helium nucleus makes a full rotation in a circle of radius 0.8 meter in 2 sec. The value of the magnetic field induction in tesla at the centre of circle will be

Explanation:

Link:

Question (3)

Which one of the following is the correct expression for magnetic field on the axis of a circular current loop with -axis as its axis?

Explanation:

Link:

Question (4)

A current of ampere flows in a wire forming a circular arc of radius metres subtending an angle at the centre as shown. The magnetic field at the centre in tesla is

Explanation:

Link:

Question (5)

An element of is placed at the origin as shown in figure which carries a large current of . distance of in perpendicular direction. The value of magnetic field is

Explanation:

Link:

Question (6)

The magnetic field due to a current carrying circular loop of radius at a point on the axis at a distance of from the centre is . What will be its value at the centre of loop?

Explanation:

Link:

Question (7)

Two concentric coils each of radius equal to are placed at right angles to each other. 3 ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in weber at the centre of the coils will be ( A.m)

Explanation:

Link:

Question (8)

A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be

Explanation:

Link:

Question (9)

A circular coil of wire consisting of 100 turns each of radius carries a current of . The magnitude of manetic field at the centre of the coil is

Explanation:

Link:

Question (10)

If we triple the radius of a coil keeping the current through it unchanged, then the magnetic field at any point at a large distance from the centre becomes approximately how much times?

Explanation:

Link:

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The magnetic field due to a current carrying circular loop of radius at a point on the axis at a distance
of from the centre is . What will be its value at the centre of loop?