Q. The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter, the change in the resistance of the wire will be

NTA AbhyasNTA Abhyas 2022 Report Error

A

200%

B

100%

C

50%

D

300%

Solution:

Let the length of the wire be l, radius of the wire be r
Resistance resistivity of the wire
Now is increased by 100%

As length is increased, its radius is going to be decreased in such a way that the volume of the cylinder remains constant.

The new resistance
Change in resistance
% change

Questions from NTA Abhyas 2022

1. A thin semicircular conducting ring of the radius is falling with its plane vertical in a horizontal magnetic induction . At the position MNQ, the speed of the ring is and the potential difference developed across the ring is

2. An ideal gas at is compressed adiabatically to of its original volume. If , then the rise in temperature is

3. Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

4. Two perfectly elastic objects and of identical mass are moving with velocities and respectively, collide along the direction of line joining them. Their velocities after the collision are respectively

5. The force of repulsion between two point charges is , when these are at distance apart. Now the point charges are replaced by non conducting spheres of radii each having the same charge as that of the respective point charges. The distance between their centres is again kept Then the force of repulsion will

Electrostatic Potential and Capacitance

Physics Most Viewed Questions

1. If and respectively denote energy and gravitational constant, then has the dimensions of:

NEET 2021 Physical World, Units and Measurements

2. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

NEET 2020 Dual Nature of Radiation and Matter

3. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

NEET 2021 Motion in a Straight Line

4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

NEET 2020 Electromagnetic Induction

5. A barometer is constructed using a liquid (density What would be the height of the liquid column, when a mercury barometer reads ?
(density of mercury

NEET 2020 Mechanical Properties of Fluids

Latest Updates