When the diameter of wire is doubled its resistance befcomes: (a) Double (b) four times (c) one - half (d) one - fourth
So, the correct option is (d)
The length of a simple pendulum is made one-fourth. Its time period becomes :
(a) four times (b) one-fourth
(c) double (d) half.
Keeping the p.d. constant, the resistance of the circuit is halved. The current will become. (a) One-fourth (b) four times (c) half (d) double