Magnetic Effects of Electric Current Choose the medium most suitable for the core of electromagnets
(1) air
(2) wood
(3) soft iron
(4) steel
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 3 Solution : -. |
Magnetic Effects of Electric Current The maximum attraction in a
magnet is -
(1) In the centre
(2) On the sides
(3) On the poles
(4) On the surface
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 3 Solution : -. |
Magnetic Effects of Electric Current The magnetic field inside a current carrying long straight solenoid is
(1) Zero
(2) Uniform
(3) non uniform
(4) cannot say as the data is insufficient
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 2 Solution : -. |
Magnetic Effects of Electric Current The magnetic field lines inside a long current-carrying solenoid are nearly :
(1) Circular
(2) Parabolic
(3) Straight
(4) Elliptical
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 3 Solution : -. |
Magnetic Effects of Electric Current An electron enters in a magnetic field at right angle to it as shown in figure.
The direction of force acting on the electron will be –
(1) to the left
(2) to the right
(3) out of the page
(4) into the page
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 4 Solution : -. |
Magnetic Effects of Electric Current The magnetic field inside a long straight solenoid carry current
(1) is zero
(2) decreases as we move towards its end
(3) increases as we move towards it s end
(4) is the same at all points
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 4 Solution : -. |
Magnetic Effects of Electric Current 
A uniform magnetic field exist in the plane of paper pointing from bottom to top
while a proton & an electron are moving from left to right as shown in figure.
The force experienced by them will be :
(1) Outwards for both
(2) Inward for electron, outward for proton
(3) Inward for proton, outward for electron
(4) Inward for both
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 2 Solution : -. |
Magnetic Effects of Electric Current An electron moving with uniform velocity in x direction enters
a region of uniform magnetic field along y direction. Which of the following
quantities is (are) non-zero and remain constant?
(I) Speed of the electron (II) Momentum of the electron (magnitude)
(III) Kinetic energy of the electron (IV) Force of the electron (magnitude)
(1) only I and II
(2) only III and IV
(3) All four
(4) only II and IV
| A. | Option 1 |
| B. | Option 2 |
| C. | Option 3 |
| D. | Option 4 |
|
Option: 3 Solution : -. |
