Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
In a series R-L-C circuit, R = 10Ω, Xc= 4Ω and XL = 9Ω. The impedance of the circuit is
4.1Ω
5.0Ω
10.8Ω
11.2Ω
Correct answer is D
The impedance for a RLC circuit is
Z=√R2+(XL−XC)2
= √102+(9−4)2
= √125
= 11.18Ω ≊ 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.
