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1. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 

Assertion (A):	Two cell of unequal emfs ${\mathrm{E}}_{1 }\mathrm{and} {\mathrm{E}}_2$ and respective internal resistances are joined together as shown, Then, one cell will continuously supply energy to the other.
Reason (R):	The potential drop across one cell will be larger than the other cell.

In the light of the above statements choose the correct answer from the options given below:
 

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

2.

Assertion : However long a fuse wire may be, the safe current that can be allowed is the same.
Reason : The safe current that can be allowed to pass through a fuse wire depends on the radius of wire. 

3.

Assertion: When current is passed through a metallic wire, it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot.
Reason: Resistance decreases due to a decrease in temperature. So, the current through the wire increases. 
1.  Both Assertion & Reason are true and the Reason is the correct explanation of the Assertion.
2.  Both Assertion & Reason are true but the Reason is not the correct explanation of the Assertion.
3.  Assertion is a true statement but Reason is false.
4.  Both Assertion and Reason are false statements.

4. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 

Assertion (A):	The current / is zero for any value of resistance R.
Reason (R):	The potential drop across 24-ohm resistor is always 4.8 V for any value of R. So, the current through R remains zero.

In the light of the above statements choose the correct answer from the options given below:
 

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

5.

Asserion : In the circuit shown in the figure, emf and internal resistance of the cell are respectively E = 2 V and r = 1 ohm. Then, the reading of the voltmeter is 1 V.

Reason : V = E - lr where, E = 2 V, l = 2/2 = 1 A and r = 1 ohm. 

6.

Asserion : In the meter bridge experiment shown in figure, the balance length AC corresponding to null deflection of the galvanometer is x. If the radius of the wire AB is doubled, the balance length becomes 4x. 

Reason : The resistance of a wire is inversely proportional to the square of its radius.
 

7. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): 
 

Assertion (A):	In the potentiometer circuit shown in figure,  E 1   and   E 2  are emfs of cells  C 1   and   C 2  respectively.  E 1   > E 2 . Cell  C 1  has negligible internal resistance. For a given resistor R, the balance length is x. If the diameter of the potentiometer wire AB is increased, the balance length x will decrease.
Reason (R):	At the balance point, the potential difference between AD due to  C 1   is   E 2 ,   the   emf   of   cell   C 2 .

In the light of the above statements choose the correct answer from the options given below:
 

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

8.

Assertion: In a space region, electric and magnetic fields act in the same direction. When a positively charged particle is projected parallel to fields, it moves undeviated.
Reason: Here, the net force on the particle is not zero.
1.  Both Assertion & Reason are true and the Reason is the correct explanation of the Assertion.
2.  Both Assertion & Reason are true but the Reason is not the correct explanation of the Assertion.
3.  Assertion is a true statement but Reason is false.
4.  Both Assertion and Reason are false statements.

9.

Given below are two statements: 

Assertion (A):	Two straight current-carrying conductors A and B are lying in a vertical plane as shown. The separation between them is h and mass per unit length is $\lambda$. Keeping A fixed, when B is raised by a small height dh, the net work done by external force per unit length will be $\lambda$gdh.
Reason (R):	The work done by magnetic field during this process is non-zero.

 

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

10.

Assertion: The flux of magnetic field $\overrightarrow{B}$ through a closed surface is zero. i.e., $\oint \overrightarrow{B} .\overrightarrow{ds} = 0$.
Reason : Magnetic field lines are closed curves. They don't have any beginning or end.
1.  Both Assertion & Reason are true and the Reason is the correct explanation of the Assertion.
2.  Both Assertion & Reason are true but the Reason is not the correct explanation of the Assertion.
3.  Assertion is a true statement but Reason is false.
4.  Both Assertion and Reason are false statements.

11.

Given below are two statements: 

Assertion (A):	In the arrangement shown, the hoop carries a constant current. This hoop can remain stationary under the effect of the magnetic field of the bar magnet.
Reason (R):	When a magnetic dipole is placed in a non-uniform magnetic field, it experiences a force opposite to the external magnetic field at its center.

 

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

12.

Assertion : Suppose we move along a line parallel to the current-carrying metal wire with a speed which is the same as the drift speed of the free electron. The magnitude of the magnetic field measured by us is zero.
Reason : Due to moving charge, magnetic field intensity at any point with respect to the observer is given by $\overrightarrow{B} = \frac{{\mu }_0}{4\pi }\frac{q\left(\overrightarrow{v}\times \overrightarrow{r}\right)}{r^3}$ where $\overrightarrow{v}$ is the velocity of charged particle with respect to observer who is measuring thefield.
 

13.

Given below are two statements: 

Assertion (A):	A uniformly moving charged particle in a uniform magnetic field, may follow a path along magnetic field lines.
Reason (R):	The direction of the magnetic force experienced by a charged particle is perpendicular to its velocity and magnetic field.-

 

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

14.

Given below are two statements: 

Assertion (A):	Two parallel wires carrying current in the same direction attract each other, whereas two proton beams moving parallel to each other repel each other.
Reason (R):	Wire-carrying current is electrically neutral, therefore it is experiencing only magnetic attraction while the electric force of repulsion between protons is more than magnetic attraction.

 

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.