Download App

Chemical Effects of Electric Current — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceChemical Effects of Electric Current1 Mark
MCQ
The diagram shows a plotting compass placed above a copper wire when there is no current flowing in the wire. What happens to the compass needle when a large direct current flows from point $A$ to point $B?$
  • A
    The compass needle points towards the right.
  • B
    The compass needle points towards the left.
  • C
    The compass needle points towards upward.
  • ✓
    The compass needle points toward downward.
✓

Answer

Correct option: D.
The compass needle points toward downward.

A current-carrying wire will produce circular magnetic field around the wire. The direction of the magnetic field follows the right hand grip rule. When the current flows from $A$ to $B,$ the magnetic field around the wire is shown in the figure.

Since the compass is placed in front of the wire, it will follow the direction of the magnetic field and turn to the right.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q. [I MARKS]" from Chemical Effects of Electric Current→Chemical Effects of Electric Current — all question types→Science STD 8 question papers→Gujarat Board STD 8 question papers→Gujarat Board question paper generator→

Similar questions

Which of the following statements are true?
$i.$ Among all the naturally occurring elements, around eighty percent are metals.
$ii.$ Non$-$metals are more abundant than metals.
$iii.$ Sodium and potassium are soft like wax.
$iv.$ Bromine is a reddish brown liquid at room temperature.
→
Mendel chose a specific plant to carry out his experiment to study the various traits. He chose the plant, because it has number of difference, easy to tell apart and not available in other plants. Which one of the following the plants he used for his study:
→
The size of the pupil of the eye is adjusted by:
→
Cyanobacteria is a $............$ component of ecosystem.
→
We know that crops requires light, moisture, water and nutrient for its proper growth and development. But, at some stage there is no competition for light, moisture and nutrients. At which stage does this happens?
→
Who is known as father of microbiology?
→
Vibration is also known as
→
Which one of the following lacks in prokaryotic cell?
→
Assertion (A) Kerosene is used in jet aircrafts.
Reason (R) Kerosene is not a fossil fuel.
→
Diameter of which of the following is about $6800\ km\ ?$
→