Class 10 Science - Chapter Magnetic effects of Electric Current NCERT Solutions | How does a solenoid behave like a magnet

The magnetic field in a given region is uniform. Draw a diagram to represent it.

Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased; (ii) a stronger horse-shoe magnet is used; and (iii) length of the rod AB is increased?

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

   (a) towards south                 (b) towards east
   (c) downward                       (d) upward

Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

Draw magnetic field lines around a bar magnet.

List the properties of magnetic field lines.

State Fleming’s left-hand rule.

Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

What is a good source of energy?

Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

What changes can you make in your habits to become more environment-friendly?

What is the difference between a reflex action and walking?

What is the importance of DNA copying in reproduction?

If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?

Why should a magnesium ribbon be cleared before burning in air?

Define the principal focus of a concave mirror.

Why do acids not show acidic behaviour in the absence of water?

Why is DNA copying an essential part of the process of reproduction?

Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?

Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?

Why are traits acquired during the life-time of an individual not inherited?

What are the different ways in which individuals with a particular trait may increase in a population?

Give an example of characteristics being used to determine how close two species are in evolutionary terms.

What are the advantages of nuclear energy?

How do Mendel’s experiments show that traits may be dominant or recessive?

Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?