Electricity and Magnetism Test

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Electricity and Magnetism Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

A 6V, 12 W lamp is connected in series with a resistor R and a source of 12 V supply. What is the value of the resistor R for the proper working of the lamp?

A
0.5Ω

B
2 Ω

C
3 Ω

D
6 Ω
Question 2
1 / -0

An electric bulb is rated 220 V and 110 W. When it is operated on 110 V, what amount of power will be consumed?

A
55 W

B
27.5 W

C
220 W

D
20 W
Question 3
1 / -0

What is the current flowing into a microwave oven that requires 800 W of power if the potential difference is 220 V?

A
3.64 A

B
0.275 A

C
2.20 A

D
8.20 A
Question 4
1 / -0

If a magnet is cut into two pieces of equal length, then

A
both the pieces will lose their magnetism

B
one piece will act as North Pole and the other as South Pole

C
both the pieces will behave as complete magnets

D
one of the pieces will lose its magnetism
Question 5
1 / -0

The strength of an electromagnet can be influenced by

A
increasing the current through the wire

B
increasing the number of loops in the coil

C
changing the core of the coil

D
All of the above

Solution

The magnetic field strength of an electromagnet can be influenced by
(1) increasing the current through the wire
(2) increasing the number of loops in the coil
(3) changing the core of the coil, use of alnico can produce stronger magnetic field.
Question 6
1 / -0

Three students A, B and C took a permanent magnet each and tried to damage it. Student A exposed it to a very high temperature, while student B hammered it strongly and student C dropped it from a very tall building.
The magnet of which of the following students is likely to be damaged?

A
Only A

B
Only B

C
Only C

D
A, B and C
Question 7
1 / -0

If `F` is the magnitude of force acting on a current (I) carrying conductor placed in a magnetic field in a direction perpendicular to it, then

A
F ∝ I^-1

B
F ∝ I²

C
F ∝ I

D
F ∝ I^-2
Question 8
1 / -0

The direction of force on a current carrying conductor placed in a magnetic field is obtained by

A
Fleming`s left hand rule

B
Fleming`s right hand rule

C
Right hand thumb rule

D
Maxwell`s rule
Question 9
1 / -0

How will the direction and magnitude of force be changed, if the current is reversed in the conductor placed in a magnetic field?

A
Direction of force will remain the same but its magnitude will be increased.

B
Direction of force and its magnitude will remain the same.

C
Direction of force will be reversed and its magnitude will be increased.

D
Direction of force will be reversed and its magnitude will remain the same.

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Re-Attempt Weekly Quiz Competition

Electricity and Magnetism Test - 4

Result

Electricity and Magnetism Test - 4

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Rank

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SHARING IS CARING

Question 1

0.5Ω

2 Ω

3 Ω

6 Ω

Question 2

55 W

27.5 W

220 W

20 W

Question 3

3.64 A

0.275 A

2.20 A

8.20 A

Question 4

both the pieces will lose their magnetism

one piece will act as North Pole and the other as South Pole

both the pieces will behave as complete magnets

one of the pieces will lose its magnetism

Question 5

increasing the current through the wire

increasing the number of loops in the coil

changing the core of the coil

All of the above

Solution

Question 6

Only A

Only B

Only C

A, B and C

Question 7

F ∝ I-1

F ∝ I2

F ∝ I

F ∝ I-2

Question 8

Fleming`s left hand rule

Fleming`s right hand rule

Right hand thumb rule

Maxwell`s rule

Question 9

Direction of force will remain the same but its magnitude will be increased.

Direction of force and its magnitude will remain the same.

Direction of force will be reversed and its magnitude will be increased.

Direction of force will be reversed and its magnitude will remain the same.

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F ∝ I^-1

F ∝ I²

F ∝ I^-2