Home
Class 12
PHYSICS
Shows a rod PQ of length 20.0 cm and mas...

Shows a rod PQ of length 20.0 cm and mass 200g suspended through a fixed point O by two threads of lengths 20.0 cm each. A magnetic field of strenght 0.500 T exists in the vicinity of the wire PQ as shown in the figure. The exists in the vicinity of the wire PQ as shown in the figure. The wires conecting PQ with the battery are loose and exert no force on PQ.(a) find the tension in the threads when the switch S is open. (b) A current of 2.0 A is established when the switch S is closed. Find the tension in the threads now.

Text Solution

Verified by Experts

(a) When switch S is open
`2T cos 30^@=mg implies T=mg//2cos 30^@=2/sqrt3=1.13N`
(b) When the switch is closed and a current passed through the circuit `=2A`
Then , `2T' cos 30^@=mg+ilB`
`2T'(sqrt3/2)=2.2 implies T'=2.2/sqrt3N`
.
Promotional Banner

Topper's Solved these Questions

  • MAGNETIC FIELD AND MAGNETIC FORCES

    CENGAGE PHYSICS ENGLISH|Exercise Solved Example|25 Videos

  • MAGNETIC FIELD AND MAGNETIC FORCES

    CENGAGE PHYSICS ENGLISH|Exercise Exercise 1.1|22 Videos

  • INDUCTANCE

    CENGAGE PHYSICS ENGLISH|Exercise Concept Based|8 Videos

  • MISCELLANEOUS VOLUME 3

    CENGAGE PHYSICS ENGLISH|Exercise True and False|3 Videos

Similar Questions

Explore conceptually related problems

A cube made from wires of equal length is connected to a battery as shown in the figure. The magnetic field at the centre of the cube is

A semicircular wire of radius 5.0 cm carries a current of 5.0 A. A magnetic field B of magnitude 0.50 T exists along the perpendicular to the plane of the wire. Find the magnitude of the magnetic force acting on the wire.

A wire carries an alternating current i=i_0sinomegat . In there an electric field in the vicinity of the wire?

In the figure shown the magnetic field on the left on PQ is zero and on the right of PQ it is uniform.Find the time spent in the magnetic field.

A conductor loop is held above a current carrying wire 'PQ' as shown in figure. Depict the direction of the current induced in the loop when the current in the wire PQ is constanly increasing.

A current carrying wire AB of the length L is turned along a circle, as shown in figure. The magnetic field at the centre O.

A wire has a length of 2.0m and a resistance of 5.0(Omega) .Find the electric field existing inside the wire if it carries a current of 10A.

A wire PQR carrying a current l is bent as shown in the figure. It is placed in a uniform magnetic field B. What is the ratio of magnitude of the force on PQ to that on QR ?

Three elastic wires PQ, PR and PS support a body P of mass M , as shown in figure. The wires are of the some material and cross sectional area, the middle one being vertical. Find the loads by each wire.