In the cosmic shower, an electron is falling towards the earth near the equator. In which direction will it be deflected?
1. Eastward
2. Westward
3. Northward
4. Southward
The endpoints of a current-carrying wire lie on the x-axis and y-axis as shown. The magnetic force on the wire is:
1. Zero
2. 6 N
3. 8 N
4. 10 N
The given figure shows a semicircular loop of radius R carrying current I and is placed in a uniform magnetic field B. The force acting on the semicircular part of the loop is
1.
2.
3.
4.
A non-conducting rod AB of length L has a positive linear charge density . This rod is rotated about its one end with an angular speed as shown. The magnetic moment associated with this rod is-
1. λ
2. λ
3.
4.
A charge is moving in a circular path of radius 'r' with speed v in a transverse magnetic field B. Specific charge of the particle is
1.
2.
3. Bvr
4.
Voltage sensitivity of a moving coil galvanometer is and current sensitivity is . Resistance of galvanometer is 'G'. The relation between is :
1.
2.
3.
4.
A straight current-carrying wire is placed along the axis of a current-carrying loop, then force between them is
1. Repulsive
2. Attractive
3. Zero
4. Cannot be predicted
An completes 40,000 revolutions in a cyclotron before exiting from it. If potential difference between the Dees is 5000 V, then the energy gained by the particle is
1. 8 MeV
2. 800 MeV
3. 4 MeV
4. 400 MeV
Two wires of large length carry equal currents each i. One wire is kept along x-axis and the other is kept along y-axis. The magnitude of magnetic field at a point on z-axis at distance d from the origin is
1.
2.
3.
4. zero
To compensate the relativistic variation of mass at high speed of charge in cyclotron. Adjustments can be made is :
1. Frequency of a.c is decreased
2. Magnetic field is increased
3. Peak value of a.c is increased
4. Both (1) & (2)