A magnetic needle lying parallel to a ma...

A magnetic needle lying parallel to a magnetic field requires `W units` of work to turn it through `60^(@)`. The torque needed to maintain the needle in this position will be

A

`sqrt3W`

B

W

C

`sqrt3(W)/2`

D

2W

Text Solution

Verified by Experts

The correct Answer is:

A

Topper's Solved these Questions

NTA NEET SET 90
NTA MOCK TESTS|Exercise PHYSICS|45 Videos
NTA NEET SET 92
NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

A magnetic needle lying parallel to a magnetic field requires X units of work to turn it through 60^(@) . The torque necessary to maintain the needle in this position is

A magnetic needle suspended parallel to a magnetic field requires sqrt3J of work to turn it through 60^@ . The torque needed to maintain the needle in this postion will be:

A magnetic needle lying parallel to the magnetic field required W units of work to turn it through an angle 45^@ The torque required to maintain the needle in this position will be

A magnetic needle lying parallel to a magnetic field requires W units of work to turn through 60^(@) . The external torque required to maintain the magnetic needle in this position is

A magnetic needle lying parallel to a magnetic field needs 2J work to turn it through 60^@ . Calculate the torque required to maintain the needle in this position.

NTA MOCK TESTS-NTA NEET SET 91-PHYSICS

The pressure P, Volume V and temperature T of a gas in the jar A and t...
Text Solution
|
A rectangular loop carrying a current i is situated near a long strai...
Text Solution
|
A magnetic needle lying parallel to a magnetic field requires W units ...
Text Solution
|
If a car covers (2)/(5)^(th) of the total distance with v1 speed and (...
Text Solution
|
From a 10 m high building a ston 'A' is dropped, and simultaneously an...
Text Solution
|
The force on a particle of mass 10g is (hati 10+hatj 5)N If it starts ...
Text Solution
|
An elevator and its load have a total mass of 800 kg. If the elevator,...
Text Solution
|
The half-life of tritium is 12.5 years. What mass of tritium of initia...
Text Solution
|
The half life of .92U^(238) against alpha -decay is 4.5xx10^9 years. W...
Text Solution
|
A tunnel is made inside earth passing throgh centre of earth. A partic...
Text Solution
|
Two springs of constants k1 and k2 have equal maximum velocities, when...
Text Solution
|
An earth- orbiting satellite has a solar energy collecting panel with ...
Text Solution
|
The fig. shows the variation of photon current with anode potential fo...
Text Solution
|
A uniform cylinder of length L and mass M having cross-sectional area ...
Text Solution
|
The spring balance A reads 2 kg with a block m suspended from it. A ba...
Text Solution
|
A biconvex lens of focal length 15 cm is in front of a plane mirror. T...
Text Solution
|
A concave mirror is placed on a horizontal table, with its axis direct...
Text Solution
|
A uniform cube of mass m and edge a moves on a horizontal surface alon...
Text Solution
|
A disc of mass 4.8 kg and radius 1 m is rolling on a horizontal surfac...
Text Solution
|
For the circuit shown in the figure :
Text Solution
|