Generate Quiz 69A71A9408FEA

1 / 10

Why picture on a TV screen become distorted when a magnet is brought near the screen?

Elimination Tool

A) Beam of electrons will be negative due to magnetic field.

B) Beam of electrons will be zero due to magnetic field.

C) Beam of electrons will be reflected due to magnetic field.

D) Beam of electrons will be deflected due to magnetic field.

2 / 10

A unit of induction is said to exist at a point where the force per unit charge experienced by a positive test charge, moving with a velocity of 1ms-1 in the direction perpendicular to the field is 1 Newton. What is this phenomenon called?

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A) Gravitational Field

B) Magnetic Field

C) Magnetic Flux

D) Flux

3 / 10

When a charge passes through a region undeflected then with Fe = Fm.

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A) B =zero

B) B ⊥ E

C) Both Options A and B are correct

D) None of these options is correct

4 / 10

In which direction Cathode raysdeflected in the presence of magnetic field?

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A) Moves upward

B) Move downward

C) Move randomly

D) Moves in straight line

5 / 10

When a charged particle enters in a strong magnetic field, its kinetic energy ______.

Elimination Tool

A) Decreases

B) Increases then decreases

C) Becomes zero

D) Remains constant

6 / 10

If ‘A’ is fundamental dimension of ampere, then the dimension of magnetic field strength is:

Elimination Tool
Hints

A) [MT2A-2]

B) [MT-²A-1]

C) [MT2A-2]

D) [MT-2A-2]

7 / 10

An a.c. generator consists of a coil of 50 turns and an area of 2.5 m2 rotating at an angular speed of 60 rad s-1 in a uniform magnetic field of 0.3 T between two fixed pole pieces. What is the flux through the coil, when the current is zero?

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A) Maximum

B) Minimum

C) Zero

D) Independent

8 / 10

A long straight current carrying conductor has current directed from bottom to top when held vertically. What will be the direction of magnetic field lines when observed from below the conductor?

Elimination Tool

A) Clockwise

B) Anti clockwise

C) Vertically upward

D) Vertically downward

9 / 10

Magnetic flux density is _______ per unit area.

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A) Electric field

B) Magnetic field

C) Magnetic lines

D) None of these

10 / 10

Find the “Lorentz force” of a charge 2.5C having an electric field of 5 units and magnetic field of 7.25 units with a velocity 1.5m/s.

Elimination Tool

A) 39.68

B) 68.93

C) 89.39

D) 89.39

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