Download App

Magnetic Effect of Current — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Effect of Current1 Mark
Question

A triangular loop of side l carries a current I. It is placed in a magnetic field B such that the plane of the loop is in the direction of B. The torque on the loop is

(a) Zero

(b) IBl

(c)  

(d)  
✓

Answer

(d)  

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Magnetic Effect of Current→Magnetic Effect of Current — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

If a magnet of pole strength m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will be

(a) m/4

(b) m/2

(c) m/8

(d) 4m
→
A free charged particle moves through a magnetic field. The particle may undergo a change in:
→

In the circuit given below, V(t) is the sinusoidal voltage source, voltage drop VAB(t) across the  resistance R is

(a) Is half wave rectified

(b) Is full wave rectified

(c) Has the same peak value in the positive and negative half cycles

(d) Has different peak values during positive and negative half cycle 

→

Four condensers each of capacity 4μF  are connected as shown in figure.  The energy stored in the system is

(a)  2400 ergs

(b) 1800 ergs

(c) 3600 ergs

(d) 5400 ergs
→
 A normal eye is not able to see objects closer than 25cm because:
  1. The focal length of the eye is 25cm.
  2. The distance of the retina from the eye-lens is 25cm.
  3. The eye is not able to decrease the distance between the eye-lens and the retina beyond a limit.
  4. The eye is not able to decrease the focal length beyond a limit.
→

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement(s) from the following

(a) The entire rod is at the same electric potential

(b) There is an electric field in the rod

(c) The electric potential is highest at the centre of the rod and decreases towards its ends

(d) The electric potential is lowest at the centre of the rod and increases towards its ends
→

Assertion :  In Young’s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper.

Reason     : The cellophane paper decrease the wavelength of light.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

→
A string of negligible thickness is wrapped several times around a cylinder kept on a rough horizontal surface. A man standing at a distance 1 from the cylinder holds one end of the string and pulls the cylinder towards him. There is no slipping anywhere. The length of the string passed through the hand of the man while the cylinder reaches his hands is:
  1. l
  2. 2l
  3. 3l
  4. 4l

→
Consider three quantities $\text{x}=\frac{\text{E}}{\text{B}},\ \text{y}=\sqrt{\frac{1}{\mu_0\in_0}}$ and $\text{z}=\frac{1}{\text{CR}}.$ Here, l is the length of a wire, C is a capacitance and R is a resistance. All other symbols have standard meanings.
→
The work done by the external force in bringing the charge q from infinity to a point is called as:
→