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Electric Charges and Fields Test 13

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Electric Charges and Fields Test 13
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  • Question 1
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    Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): The basic difference between magnetic lines of force and electric lines of force is electric lines of force are discontinuous and magnetic lines of force are continuous.

    Reason (R): Magnetic lines of force exist in a magnet but no electric lines of force exists in a charged body.

    Solution

    Let us consider an electric dipole. The electric lines of force exists outside only and not inside the dipole. Let us now consider a magnetic dipole. The magnetic lines of force exist outside as well as inside the dipole. So, it can be said that magnetic lines of force are continuous and electric lines of force are discontinuous. So assertion and reason both are true and reason explains the assertion too.

  • Question 2
    1 / -0

    Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): When bodies are charged through friction, there is transfer of charge from one body to another. No charge is created or destroyed.

    Reason (R): This is according to the law of conservation of electric charge.

    Solution

    When two bodies are rubbed, electrons move from one body to another. The body which loses electrons becomes positively charged. The body which receives the electron becomes negatively charged. So, the assertion is true. Law of conservation of electric charge states that electric charge can neither be created nor destroyed. In a closed system, the amount of charge remains the same. Hence the reason is also true and properly explains the assertion.

  • Question 3
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    Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): In a cavity in a conductor, the electric field is zero.

    Reason (R): Charges in a conductor reside only at its surface.

    Solution

    The charge enclosed by the Gaussian surface surrounding the cavity is zero. Hence, the electric field is also zero. So, the assertion is true. Charges in a conductor reside only at its surface. So, in the cavity there is no charge. So, the reason is also true and properly explains the assertion.

  • Question 4
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    Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

    Assertion (A): Using Gauss law, it is possible to find the electric field at any point.

    Reason (R): Gauss law is applicable for any type of charge distribution.

    Solution

    Considering a suitable Gaussian surface, we can easily find the electric field at any point. So, the assertion is true. But it is very very difficult to apply Gauss law, if the charge distribution is so that the Gaussian surface is complicated in shape. So, the reason is false.

  • Question 5
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : A metallic shield in the form of a hollow shell may be built to block an electric field.

    Reason : In a hollow spherical shield, the electric field inside it is zero at every point.

    Solution

    In any metallic shield, due to the electric field the electric charge will be induced in such a way that the combination of the negative charge and the positive charge gives the net electric charge equal to zero. As a result at any point the electric field is zero. Hence, the metallic field in the form of the hollow shell probably is built to block an electric field.

    Therefore, both the Assertion and the Reason are true and reason is the correct explanation of assertion.

  • Question 6
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    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : The Coulomb force is the dominating force in the universe.

    Reason : The Coulomb force is weaker than the gravitational force.

    Solution

    Gravitational force is the dominating force in the universe so assertion is false. Gravitational force is weaker than Coulombic force so, reason is false

  • Question 7
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : When bodies are charged through friction, there is a transfer of electric charge from one body to another, but no creation or destruction of charge.

    Reason : This follows from conservation of electric charges.

    Solution

    Conservation of electric charge states that the total charge of an isolated system remains unchanged with time

  • Question 8
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : Some charge is put at the centre of a conducting sphere. It will move to the surface of the sphere.

    Reason : Conducting sphere has no free electrons at the centre.

    Solution

    Because of repulsion, the free electrons will mole to the outer surface.

  • Question 9
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : The coulomb force is the dominating force in the universe.

    Reason : The coulomb force is weaker than the gravitational force.

    Solution

    Gravitational force is the dominating force in nature and not coulomb’s force. Gravitational force is the weakest force. Also, Coulomb’s force > > gravitational force.

  • Question 10
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : The property that the force with which two charges attract or repel each other are not affected by the presence of a third charge.

    Reason : Force on any charge due to a number of other charges is the vector sum of all the forces on that charge due to other charges, taken one at a time.

    Solution

    Force on any charge due to a number of other charges is the vector sum of all the forces on that charge due to the other charges, taken one at a time. The individual force are unaffected due to the presence of other charges. This is the principle of superposition of charges.

  • Question 11
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    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : A point charge is brought in an electric field, the field at a nearby point will increase or decrease, depending on the nature of charge.

    Reason : The electric field is independent of the nature of charge.

    Solution

    The electric field will increase if positive charge is brought in an electric field.

  • Question 12
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : When a conductor is placed in an external electrostatic field, the net electric field inside the conductor becomes zero after a small instant of time.

    Reason : It is not possible to set up an electric field inside a conductor.

    Solution

    Statement-1 is correct. The induced field cancels the external field. Statement-2 is false. When a current is set up in a conductor, there exists an electric field inside it.

  • Question 13
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : On bringing a positively charged rod near the uncharged conductor, the conductor gets attracted towards the rod.

    Reason : The electric field lines of the charged rod are perpendicular to the surface of the conductor.

    Solution

    Though the net charge on the conductor is still zero but due to induction the negatively charged region is nearer to the rod as compared to the positively charged region. That is why the conductor gets attracted towards the rod

  • Question 14
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : On disturbing an electric dipole in stable equilibrium in an electric field, it returns back to its stable equilibrium orientation.

    Reason : A restoring torque acts on the dipole on being disturbed from its stable equilibrium.

    Solution

    The restoring torque brings it back to its stable equilibrium.

  • Question 15
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion : The electric flux of the electric field ∮ E.dA is zero. The electric field is zero everywhere on the surface.

    Reason : The charge inside the surface is zero.

    Solution

    Using Gauss’s Law; if the electric field is zero everywhere, then the flux may be zero. if charge inside the closed surface is zero, then flux must be zero.

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