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An induced emf is produced when a magnet is:
Anonymous Quiz
46%
(a) Placed inside a coil at rest
20%
(b) Kept stationary inside a coil
19%
(c) Removed from inside a coil
16%
(d) None of these
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In an ideal transformer, the primary coil has 100 turns and the secondary has 200 turns. If the primary voltage is 220 V, the secondary voltage is:
Anonymous Quiz
22%
(a) 110 V
28%
(b) 220 V
46%
(c) 440 V
4%
(d) 880 V
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In an LCR series circuit, the power dissipation takes place only in:
Anonymous Quiz
14%
a) Inductor
20%
b) Capacitor
19%
c) Resistor
47%
d) All three elements
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At resonance, the current in a series LCR circuit is:
Anonymous Quiz
43%
a) Maximum
18%
b) Minimum
25%
c) Zero
13%
d) Constant
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The focal length of a concave mirror is 15 cm. What is its radius of curvature?
Anonymous Quiz
34%
A. 7.5 cm
10%
B. 15 cm
54%
C. 30 cm
1%
D. 45 cm
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Which mirror is used by dentists to see a magnified image of teeth?
Anonymous Quiz
6%
A. Plane mirror
44%
B. Convex mirror
47%
C. Concave mirror
3%
D. Cylindrical mirror
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