A
B
C
D
Correct answer is B
By convention, the field direction is taken to be outward from the North pole and in to the South pole of the magnet. Also, they form closed lines.
4.1\(\Omega\)
5.0\(\Omega\)
10.8\(\Omega\)
11.2\(\Omega\)
Correct answer is D
The impedance for a RLC circuit is
\(Z = \sqrt{R^{2} + (X_{L} - X_{C})^{2}}\)
= \(\sqrt{10^{2} + (9 - 4)^{2}}\)
= \(\sqrt{125}\)
= 11.18\(\Omega\) \(\approxeq\) 11.2\(\Omega\)
In which of the following activities is an induction coil not useful?
Investigation of high voltages
Study of electric discharge
Operation of X-ray tubes
A.C. power transmission
Correct answer is D
No explanation has been provided for this answer.
Which of the following statements about magnetic lines of force is not correct? They
pass through even non-magnetic materials
run from the north pole to the south pole
are in a state of tension and tend to be shorted
intersect one another
Correct answer is D
Two magnetic lines of force can not intersect each other.
2A
3A
5A
8A
Correct answer is B
Ammeters are connected in series so,
A3= A2 + A1
A1 = A3 - A1
= 5A - 2A
= 3A
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