If the diameter of a wire is doubled, its current carrying capacity becomes one-

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Question
If the diameter of a wire is doubled, its current carrying capacity becomes
Options
A. one-fourth
B. half
C. twice
D. four times

Correct Answer

four times

Explanation

Current carrying capacity depends on area of cross-section.

Materials and Components problems

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1. Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be
Options
A. 0.08
B. 0.04
C. 0.001
D. 0.0001

2. Assertion (A): If E is available energy state eV and E_F is Fermi level, then probability of energy state E being occupied = 0.5.
Reason (R): .
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

4. In a true valence crystal, the bonding between the atoms is accomplished by the sharing of valence electrons.
Options
A. True
B. False

5. Which element exhibits the property of inertia?
Options
A. Resistance
B. Capacitance
C. Inductance
D. Both resistance and inductance

6. The time constant of the circuit in figure shown.
Options
A. RC
B.
C.
D.

8. A current is flowing through a conductor with non-uniform area of cross-section. Then
Options
A. current will be different at different cross-sections.
B. current will be the same at all the cross-sections.
C. current will be different but current density will be same at all the cross-sections
D. current will be the same but current density will be different at different cross-sections.

9. In an RC series circuit R = 100 ? and X_C = 10 ?. In this circuit
Options
A. the current and voltage are in phase
B. the current leads the voltage by about 6�
C. the current leads the voltage by about 84�
D. the current lags the voltage by about 6�

10. In the circuit of figure, the switch is closed at t = 0. At t = 0⁺ the current through C is
Options
A. 4 A
B. 2.5 A
C. 3.1 A
D. 0

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