1
IIT-JEE 2008 Paper 2 Offline
+3
-1

STATEMENT 1 : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.

and

STATEMENT 2 : Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

A
Statement 1 is True, Statement 2 is True; Statement 2 is a CORRECT explanation for Statement 1
B
Statement 1 is True, Statement 2 is True; Statement 2 is a NOT CORRECT explanation for Statement 1
C
Statement 1 is True, Statement 2 is False
D
Statement 1 is False, Statement 2 is True
2
IIT-JEE 2007 Paper 2 Offline
+3
-1

A magnetic field $$\overrightarrow{\mathrm{B}}=\mathrm{B}_{0} \hat{j}$$ exists in the region $$a < x < 2 a$$ and $$\overrightarrow{\mathrm{B}}=-\mathrm{B}_{0} \hat{j}$$, in the region $$2 a < x < 3 a$$, where $$\mathrm{B}_{0}$$ is a positive constant. A positive point charge moving with a velocity $$\vec{v}=v_{0} \hat{i}$$, where $$v_{0}$$ is a positive constant, enters the magnetic field at $$x=a$$. The trajectory of the charge in this region can be like,

A
B
C
D
3
IIT-JEE 2007 Paper 2 Offline
+4
-0

Two wires each carrying a steady current I are shown in four configurations in Column I. Some of the resulting effects are described in Column II. Match the statements in Column I with the statements in Column II and indicate your answer by darkening appropriate bubbles in the $$4 \times 4$$ matrix given in the ORS.

Column I Column II
(A) Point P is situated midway between the wires.
(P) The magnetic fields (B) at P due to the currents in the wire are in same direction.
(B) Point P is situated at the mid-point of the line joining the centers of the circular wires, which have same radii.
(Q) The magnetic fields (B) at P due to the currents in the wires are in opposite directions.
(C) Point P is situated at the mid-point of the line joining the centers of the circular wires, which have same radii.
(R) There is no magnetic field at P.
(D) Point P is situated at the common center of the wires.
(S) The wires repel each other.

A
$$[\mathrm{A} \rightarrow(\mathrm{P}, \mathrm{R}) ; \mathrm{B} \rightarrow(\mathrm{P}); \mathrm{C} \rightarrow(\mathrm{P}, \mathrm{R}); \mathrm{D} \rightarrow(\mathrm{Q, R})]$$
B
$$[\mathrm{A} \rightarrow(\mathrm{Q}, \mathrm{R}) ; \mathrm{B} \rightarrow(\mathrm{P}); \mathrm{C} \rightarrow(\mathrm{Q}, \mathrm{R}); \mathrm{D} \rightarrow(\mathrm{Q})]$$
C
$$[\mathrm{A} \rightarrow(\mathrm{P}, \mathrm{R}) ; \mathrm{B} \rightarrow(\mathrm{P}); \mathrm{C} \rightarrow(\mathrm{P}, \mathrm{R}); \mathrm{D} \rightarrow(\mathrm{Q})]$$
D
$$[\mathrm{A} \rightarrow(\mathrm{S}, \mathrm{R}) ; \mathrm{B} \rightarrow(\mathrm{P}); \mathrm{C} \rightarrow(\mathrm{P}, \mathrm{R}); \mathrm{D} \rightarrow(\mathrm{Q})]$$
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