1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
A
anti ferromagnetism
B
no magnetic property
C
diamagnetism
D
paramagnetism.
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment $$\mu $$ is given by
A
$$qv{R^2}$$
B
$$qv{R^2}/2$$
C
qvR
D
qvR/2
3
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
A
50%
B
90%
C
10%
D
30%
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
What is the value of inductance L for which the current is maximum in a series LCR circuit with C = 10 $$\mu $$F and $$\omega $$ = 1000 s$$-$$1 ?
A
1 mH
B
cannot be calculated unless R is known
C
10 mH
D
100 mH
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