1
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
Copper and silicon is cooled from 300 K to 60 K , the specific resistance
A
decrease in copper but increase in silicon
B
increase in copper but decrease in silicon
C
increase in both
D
decrease in both
2
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
If specific resistance of a potentiometer wire is 10-7$$\Omega $$ m and current flow through it is 0.1 amp., cross-sectional area of wire is 10$$-$$6 m2 then potential gradient will be
A
10$$-$$2 volt/m
B
10$$-$$4 volt/m
C
10$$-$$6 volt/m
D
10$$-$$8 volt/m.
3
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
If number of turns, area and current through a coil is given by n, A and $$i$$ respectively then its magnetic moment will be
A
$$niA$$
B
$${n^2}iA$$
C
$$ni{A^2}$$
D
$${{ni} \over {\sqrt A }}$$
4
AIPMT 2001
MCQ (Single Correct Answer)
+4
-1
An electron having mass m and kinetic energy E anter in uniform magnetic field B perpendiculaly, then its frequency will be
A
$${{eE} \over {qvB}}$$
B
$${{2\pi m} \over {eB}}$$
C
$${{eB} \over {2\pi m}}$$
D
$${{2m} \over {eBE}}$$
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