Physics Test 81

Result

Physics Test 81

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Weekly Quiz Competition

Question 1
4 / -1

Tangent law is applicable to a dipole placed in two magnetic field and when :

A
makes an angle with

B
is directed opposite to

C

D
Question 2
4 / -1

Two identical short bar magnets each having magnetic moment M are placed at a distance of 2d with their axes perpendicular to each other in a horizontal plane. The magnetic induction at a point mid way between them is :

A

B

C

D

Solution
Question 3
4 / -1

In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. the path of the particle will be 'a' :

A
Circle

B
Helix

C
Straight line

D
Ellipse

Solution
Question 4
4 / -1

Along the direction of current carrying wire, the value of magnetic field is :

A
Zero

B
Infinity

C
Depends on the length of the wire

D
Uncertain

Solution
Question 5
4 / -1

The distance between the wires of electric mains is 12 cm. These wires experience 4 µg wt per unit length. The value of current flowing in each wire will be :

A
4.85A

B
0

C
4.85 × 10^–2 A

D
4.85 × 10^–4 A

Solution
Question 6
4 / -1

Two insulated wires of ∞ length are lying mutually at right angles to each other as shown in the figure. Current of 2A and 1.5 A respectively are flowing in them. The value of magnetic induction at point P will be :

A
2 × 10^–3 N/A-m

B
2 × 10^–5 N/A-m

C
0

D
2 × 10^–4 N/A-m

Solution
Question 7
4 / -1

When the numbers of turns in a toroidal coil is doubled, the value of magnetic flux density will become :

A
Four times

B
Eight times

C
Half

D
Double

Solution
Question 8
4 / -1

An electric current I is flowing in a circular coil of radius a. At what distance from the centre of the coil on the axis will the magnetic field be 1/8^th of its value at the centre ?

A
3a

B

C

D

Solution
Question 9
4 / -1

A charged particle is moving along a magnetic field line. The magnetic force on the particle is :

A
Along the velocity

B
Opposite to its velocity

C
Perpendicular to its velocity

D
Zero

Solution
Question 10
4 / -1

An electron enters a magnetic field along perpendicular direction. Following quantity will remain constant :

A
Momentum

B
Kinetic energy

C
Velocity

D
Acceleration

Solution

v(speed) remains constant
∴ K.E. remains constant